Seagate DJ Equipment ST118202LW LC User Guide

Cheetah 18  
Disc Drive  
ST118202LW/LC  
Installation Guide  
 
Cheetah 18 Installation Guide, Rev. A  
1
Preface  
This manual contains information for users of the Seagate®  
Cheetah 18 SCSI disc drives. It provides support services, per-  
formance specifications, and initial setup information. Additional  
information is available in the Cheetah 18 Product Manual (part  
number 83329260). Contact your Seagate sales representative if  
you need to order this publication.  
Electrostatic discharge protection  
Caution. Removal of circuit boards by personnel not perform-  
ing depot repair will damage components and may  
void the warranty.  
All drive electronic assemblies are sensitive to static electricity,  
due to the electrostatically sensitive devices used within the  
drive circuitry. Although some devices such as metal-oxide semi-  
conductors are extremely sensitive, all semiconductors, as well  
as some resistors and capacitors, may be damaged or degraded  
by exposure to static electricity.  
Electrostatic damage to electronic devices may be caused by the  
direct discharge of a charged conductor or by exposure to the  
static fields surrounding charged objects. To avoid damaging  
drive electronic assemblies, observe the following precautions  
when installing or servicing the drive:  
• Ground yourself to the drive whenever the drive electronics  
are or will be exposed. Connect yourself to ground with a wrist  
strap (Seagate part number 12263496). Connection may be  
made to any grounded metal assembly. As a general rule,  
remember that you and the drive electronics must all be  
grounded to avoid potentially damaging static discharges.  
 
   
2
Cheetah 18 Installation Guide, Rev. A  
Turn off the power before removing or installing the DC power  
cable.  
• Do not remove any circuit boards from the drive.  
• Never use an ohmmeter on any circuit boards.  
• When installing the drive on a carrier or tray, discharge the car-  
rier or tray prior to inserting it into the system.  
Important safety information and precautions  
Caution.  
Use forced-air ventilation when bench-testing the  
drive to ensure proper cooling of drive components.  
Use proper safety techniques for safe, reliable operation of this  
unit.  
The procedures in this manual and labels on the unit contain  
warnings and cautions that must be carefully read and followed  
to minimize or eliminate the risk of personal injury. The warnings  
point out conditions or practices that may endanger you or oth-  
ers. The cautions point out conditions or practices that may dam-  
age the unit, possibly making it unsafe for use.  
Always observe the following warnings and precautions:  
• Follow all cautions and warnings in the procedures.  
• Use sound safety practices when operating, installing, or  
removing the unit.  
• Use caution when troubleshooting a unit that has voltages  
present. Turn off power to the unit before removing it.  
• Ensure that the internal temperature of the rack or cabinet  
does not exceed the limits defined for the drive when the drive  
is mounted in an equipment rack or cabinet. When units are  
 
 
Cheetah 18 Installation Guide, Rev. A  
3
stacked vertically, pay special attention to the top where tem-  
peratures are usually highest.  
• Follow the precautions listed above in “Electrostatic discharge  
protection.”  
• Do not remove any circuit boards from the drive. Return the  
entire drive for depot repair if any circuit board is defective.  
Removal of circuit boards by personnel not performing depot  
repair will damage components and may void the warranty.  
• Do not separate the head and disc assembly (HDA) from the  
PCB. Return the entire drive for depot repair if the HDA is  
defective.  
• Do not attempt to disassemble the HDA. It is not field repair-  
able. If the sealed HDA is opened by personnel not performing  
depot repair, this will damage components and void the  
warranty.  
As a component, this drive is designed to be installed and oper-  
ated in accordance with UL1950, EN60950, CAN/CSA C22.2  
950-95, and VDE0805.  
Seagate takes all reasonable steps to ensure that its products  
are certifiable to currently accepted standards. Typical applica-  
tions of these disc drives include customer packaging and sub-  
system design. Safety agencies conditionally certify component  
assemblies, such as the Cheetah disc drive, based on their final  
acceptability in the end-use product. The subsystem designers  
are responsible for meeting these conditions of acceptability in  
obtaining safety-regulatory agency compliance in their end-use  
products and for certifying where required by law. A necessary  
part of meeting safety requirements is the provision for overcur-  
rent protection on drive SELV supply voltages.  
 
4
Cheetah 18 Installation Guide, Rev. A  
This unit is a component part and as such is not meant to com-  
ply with FCC or similar national requirements as a stand-alone  
unit. Engineering radiated emissions test results are available  
through the Seagate Safety Department to assist the subsystem  
designer.  
Wichtige Sicherheitshinweise  
Vorsicht.  
Beim Testen des Laufwerks auf dem Prüftisch ist  
Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der  
Laufwerkkomponenten sicherzustellen.  
Verwenden Sie geeignete Sicherheits- um den sicheren, zuver-  
lässigen Betrieb dieser Einheit zu gewährleisten.  
Die Verfahren in diesem Handbuch und die Aufkleber auf dem  
Gerät enthalten Warn- und Vorsichtshinweise. Diese Hinweise  
sind sorgfältig durchzulesen und zu beachten, um das Risiko  
von Verletzungen auf ein Mindestmaß zu beschränken oder  
ganz zu vermeiden. Die Warnhinweise machen auf Situationen  
oder Praktiken aufmerksam, die Sie oder andere gefährden  
könnten. Die Vorsichtshinweise machen auf Situationen oder  
Praktiken aufmerksam, die Einheit beschädigen können, so daß  
deren Gebrauch mit Risiko behaftet ist.  
Die Warn- und Vorsichtshinweise sind nicht allumfassend! Es ist  
uns einfach nicht möglich, alle Wartungsmethoden oder die  
eventuellen Risiken jeder Methode zu kennen, zu beurteilen und  
Sie entsprechend zu beraten. Aus diesem Grund haben wir auf  
eine derartige umfassende Beurteilung verzichtet. Falls Sie ein  
hier nicht beschriebenes Verfahren oder Werkzeug verwenden,  
stellen Sie zuerst sicher, daß das gewählte Verfahren weder Ihre  
persönliche Sicherheit noch die Leistung der Einheit gefährdet.  
 
 
Cheetah 18 Installation Guide, Rev. A  
5
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-  
shinweise:  
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem  
Handbuch.  
Treffen Sie beim Betrieb, bei der Installation oder bei der  
Entfernung der Einheit angemessene Sicherheitsvorkehrun-  
gen.  
• Wenn eine Einheit unter Spannung steht, gehen Sie bei der  
Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die  
Einheit aus, bevor Sie mit den Installations-und Entfernungsar-  
beiten beginnen.  
• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse  
montiert ist, sorgen Sie dafür, daß die Temperatur im Inneren  
des Gestells oder Gehäuses die für das Laufwerk vorgege-  
benen Grenzwerte nicht übersteigt. Wenn Einheiten vertikal  
übereinander betestigt werden, achten Sie besonders auf den  
oberen Stapelbereich, da dort die Temperatur gewöhnlich am  
höchsten ist.  
• Befolgen Sie die oben unter “Electrostatic Discharge Protec-  
tion” angegebenen Sicherheitsmaßnahmen.  
• Nehmen Sie keine Platinen aus dem Laufwerk. Wenn eine  
Platine defekt ist, muß das gesamte Laufwerk zur Reparatur  
eingeschickt werden. Die Herausnahme von Platinen durch  
andere Personen als die für die werkseitige Reparatur zustän-  
digen kann zu einer Beschädigung der Komponenten und  
Erlöschen des Garantieanspruchs führen.  
 
6
Cheetah 18 Installation Guide, Rev. A  
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus  
dem Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist,  
schicken Sie das gesamte Laufwerk zur Reparatur ein.  
• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinan-  
dergenommen werden! Öffnen der versiegelten HDA durch  
andere Personen als die für die werkseitige Reparatur zustän-  
digen hat eine Beschädigung der Komponenten und  
Erlöschen des Garantieanspruchs zur Folge.  
Als Teilkomponente ist dieses Laufwerk für die Installation und  
den Betrieb in Übereinstimmung mit UL 1950, EN60950, CAN/  
CSA C22.2 950-95 und VDE0805 vorgesehen.  
Seagate ist ständig bemüht, die Zulassungsfähigkeit von  
Seagate-Produkten im Rahmen der gegenwärtig geltenden  
Standards zu gewährleisten. Zu den typischen Anwendungen  
dieser Festplattenwerke zählen Systemeinbau durch den  
Kunden und die Konstruktion von Untersystemen. Sicherheitsbe-  
hörden gewähren eine bedingte Zulassung für Komponenten wie  
das Cheetah-Festplattenlaufwerk vorbehaltlich der endgültigen  
Zulasssung im Endprodukt. Designer von Untersystemen sind  
dafür verantwortlich, die Voraussetzungen für die Einhaltung  
sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren  
Endprodukten und - falls gesetzlich vorgeschrieben - für die  
Zulassung zu schaffen. Eine Grundvoraussetzung zur Einhal-  
tung der Sicherheitsanforderungen ist die Bereitstellung eines  
Überlastschutzes für die SELV-Versorgungsspannungen des  
Laufwerks.  
Dieses Gerät ist eine Baugruppe und unterliegt als solche nicht  
den Anforderungen der FCC oder ähnlicher nationaler Behörden  
für eigenständige Geräte. Technische Testergebnisse zu elektro-  
 
Cheetah 18 Installation Guide, Rev. A  
7
magnetische Strahlung sind für Designer von Untersystemen auf  
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.  
Regulatory agency compliance  
Electromagnetic susceptibility  
As a component assembly, the drive is not required to meet any  
susceptibility performance requirements. It is the responsibility of  
those integrating the drive within their systems to perform those  
tests required and design their system to ensure that equipment  
operating in the same system as the drive or external to the sys-  
tem does not adversely affect the performance of the drive. See  
DC power requirements on page 18.  
Electromagnetic compliance  
Seagate uses an independent laboratory to confirm compliance  
to the directives/standard(s) for CE Marking and C-Tick Marking.  
The drive was tested in a representative system for typical appli-  
cations. The selected system represents the most popular char-  
acteristics for test platforms. The system configurations include:  
• 486, Pentium, and PowerPC microprocessors  
• 3.5-inch floppy disc drive  
• Keyboard  
• Monitor/display  
• Printer  
• External modem  
• Mouse  
Although the test system with this Seagate model complies to  
the directives/standard(s), we cannot guarantee that all systems  
will comply. The computer manufacturer or system integrator  
 
 
8
Cheetah 18 Installation Guide, Rev. A  
shall confirm EMC compliance and provide CE Marking and C-  
Tick Marking for their product.  
Electromagnetic compliance for the European Union  
If this model has the CE Marking it complies with the European  
Union requirements of the Electromagnetic Compatibility Direc-  
tive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/  
EEC of 28 April 1992 and Directive 93/68/EEC of 22 July 1993.  
Australian C-Tick  
If this model has the C-Tick Marking it complies with the Austra-  
lia/New Zealand Standard AS/NZS3548 1995 and meets the  
Electromagnetic Compatibility (EMC) Framework requirements  
of Australia’s Spectrum Management Agency (SMA).  
 
Cheetah 18 Installation Guide, Rev. A  
Seagate Technology support services  
Presales support  
9
To determine which Seagate products are best suited for your  
specific application, contact us about configuration and compati-  
bility and for current product availability. You can leave a voice  
message after business hours or send an e-mail message—we  
reply during business hours.  
Disc Drives 405-936-1210 Fax: 405-936-1683  
A.M.  
P M  
P M  
P.M.  
(8:00  
to 12:15 . ., 1:30 . . to 6:00 , central time, M-F)  
Tape Products 1-800-626-6637 or 714-641-2500  
A.M. P.M.,  
pacific time, M-F)  
Fax: 714-641-2410 (6:00  
to 5:00  
Note. You can purchase select tape products and tape acces-  
sories through Seagate Express 24 hours daily by calling  
1-800-531-0968 or by faxing your order to 972-481-4812.  
Technical support services  
If you need assistance installing your drive, consult your dealer.  
Dealers are familiar with their unique system configurations and  
can help you with system conflicts and other technical issues. If  
®
you need additional assistance with your Seagate drive or other  
Seagate products, use one of the Seagate technical support ser-  
vices listed below.  
SeaFONE® 1-800-SEAGATE  
Seagate’s 800 number (1-800-732-4283) allows toll-free access  
to automated self-help services, providing answers to commonly  
 
 
10  
Cheetah 18 Installation Guide, Rev. A  
asked questions, troubleshooting tips, and specifications for disc  
drives and tape drives. This service is available 24 hours daily  
and requires a touch-tone phone. International callers can reach  
this automated self-help service by dialing 405-936-1234.  
Online services  
Using a modem, you can obtain troubleshooting tips, free utility  
programs, drive specifications and jumper settings for Seagate’s  
entire product line. You can also download software for installing  
and analyzing your drive.  
SeaNET  
You can obtain technical information about Seagate products  
over the Internet from Seagate’s World Wide Web home page  
(http://www.seagate.com)  
(ftp://  
or Seagate’s ftp server  
. You can also send E-mail with your questions  
DiscSupport @ Seagate.com TapeSupport @  
ftp.seagate.com)  
to  
Seagate.com  
or  
.
Seagate CompuServe forum  
Online technical support for Seagate products is available on  
CompuServe. To access our technical support forum, type go  
seagate. This forum provides information similar to that found on  
SeaBOARD. In addition, you can type questions or browse  
through previous questions and answers on the forum mes-  
sages.  
SeaBOARD®  
SeaBOARD is a computer bulletin board system that contains  
information about Seagate disc and tape drive products and is  
available 24 hours daily. Set your communications software to  
eight data bits, no parity, and one stop bit (8-N-1).  
 
Cheetah 18 Installation Guide, Rev. A  
11  
Location  
Australia  
France  
Germany  
Taiwan  
Thailand  
UK  
Phone number  
61-2-9756-2359  
33 1-48 25 35 95  
49-89-140-9331  
886-2-2719-6075  
662-531-8111  
44-1628-478011  
USA  
Disc: 405-936-1600; Tape: 405-936-1630  
FAX services  
SeaFAX®  
You can use a touch-tone telephone to access Seagate’s auto-  
mated FAX system to receive technical support information by  
return FAX. This service is available 24 hours daily.  
Location  
Australia  
Germany  
UK  
Phone number  
61-2-9756-5170  
49-89-1430-5102  
44-1628-894084  
USA  
Disc: 405-936-1620; Tape: 405-936-1640  
Technical support FAX  
You can FAX questions or comments to technical support spe-  
cialists 24 hours daily. Responses are sent during business  
hours.  
Location  
Australia  
France  
Phone number  
61-2-9725-4052  
33 1-46 04 42 50  
 
12  
Cheetah 18 Installation Guide, Rev. A  
Location  
Phone number  
49-89-1430-5100  
Germany  
Hong Kong 852-2368 7173  
Japan  
Korea  
Singapore  
Taiwan  
UK  
81-3-5462-2979  
82-2-556-4251/7395  
65-488-7528  
886-2-2715-2923  
44-1628-890660  
USA  
Disc: 405-936-1685; Tape: 405-936-1683  
Direct-support services  
Technical support  
For one-on-one help, you can talk to a technical support special-  
ist during local business hours. Before calling, note your system  
configuration and drive model number (STxxxx).  
Location  
Phone number  
A.M.  
P.M.  
Australia  
61-2-9725-3366 (9:00  
time, M–F)  
to 5:00  
, eastern  
A.M.  
P.M.  
France  
33 1-41 86 10 86 (9:30  
to 12:30  
,
P.M.  
P.M.  
2:00  
to 5:00  
, M–F)  
Germany  
Disc: 49-89-140-9332; Tape: 49-89-140-9333  
A.M.  
P.M.  
P.M.  
P.M.  
to 4:00 ,  
(9:30  
M–F)  
to 12:30  
, 2:00  
Hong Kong 852-2368 9918  
A.M.  
P.M.  
, 1:00  
Korea  
82-2-531-5800 (9:00  
P.M. P.M.  
to 12:00  
to 6:00  
65-488-7584 (9:00  
P.M.  
, M–F)  
A.M.  
P.M.  
to 12:00 , 2:00  
P.M.  
Singapore  
Taiwan  
to 5:00  
, M–F)  
886-2-2514-2237  
 
Cheetah 18 Installation Guide, Rev. A  
13  
Location  
Phone number  
A.M.  
P.M.  
,
UK  
44-1628-894083 (10:00  
to 1:00  
P.M.  
P.M.  
2:00  
to 5:00  
, M–F)  
USA  
Please dial 1-800-SEAGATE or 405-936-1234  
for the specific product telephone number.  
A.M.  
P.M.  
P.M.  
P.M.  
to 6:00 ,  
(8:00  
central time, M–F)  
to 12:15  
, 1:30  
SeaTDD™ 405-936-1687  
Using a telecommunications device for the deaf (TDD), you can  
send questions or comments 24 hours daily and exchange mes-  
A.M.  
sages with a technical support specialist between 8:00  
to  
P.M.  
12:15 P.M. and 1:30 P.M. to 6:00  
through Friday.  
(central time) Monday  
Customer service centers  
Seagate direct OEM, Distribution, and Systems Integrator cus-  
tomers should contact their Seagate service representative for  
warranty information. Other customers should contact their place  
of purchase. Seagate offers comprehensive customer support  
for all Seagate drives. These services are available worldwide.  
Location  
Phone number  
FAX number  
Asia Pacific and Australia  
65-485-3595  
65-488-7503  
Europe, Middle East,  
and Africa  
31-2031-67300  
31-2065-34320  
Japan  
USA  
81-3-5462-2904 81-3-5462-2979  
1-800-468-3472 405-949-6740  
Other Americas (Brazil,  
Canada, Mexico)  
405-949-6706  
405-949-6738  
 
14  
Cheetah 18 Installation Guide, Rev. A  
Phone number FAX number  
Location  
Manufacturer’s representatives  
Brazil  
MA Informatica  
55-21-516-6649 55-21-516-5280  
Canada  
Memofix  
Adtech  
905-660-4936  
905-812-8099  
1-800-624-9857  
905-660-8738  
905-812-7807  
Mexico  
Abicom Seamax  
SA DE CV  
Southern Europe  
Caesar Italia  
525-546-4888  
39-688-18149  
525-546-4888  
39-688-02103  
 
Cheetah 18 Installation Guide, Rev. A  
15  
General description  
Cheetah 18 SCSI disc drives are high-speed, random-access  
digital-data storage devices capable of operating in single-ended  
(SE) or low voltage differential (LVD) modes.  
These two modes are offered to allow you to use this drive in  
systems that use the traditional SE technology or to use it in  
LVD-capable systems. Refer to page 20 for additional informa-  
tion about LVD technology.  
The drive is a component for installation in an enclosure  
designed for the drive. This is often a rack within the system or  
an external enclosure designed to house one or more disc drives  
or other peripheral units. In either case, the disc drive must  
receive adequate cooling (refer to “Providing adequate cooling”)  
and it must be sufficiently grounded and shielded from emis-  
sions. The Cheetah 18 Product Manual (part number 83329260)  
contains guidelines for a properly designed enclosure.  
Attention. This high performance Cheetah disc drive must have  
proper power and cooling for reliable operation.  
 
 
16  
Cheetah 18 Installation Guide, Rev. A  
Figure 1. Cheetah 18 family drive (ST118202LW shown)  
 
Cheetah 18 Installation Guide, Rev. A  
17  
Characteristics  
ST118202LW/LC  
Interface  
Ultra2 SCSI1  
Capacity  
Unformatted (Gbytes)  
Formatted (Gbytes)2  
22.54  
18.21  
Recording  
Cylinders (user)  
Read/write data heads  
Avg bytes/track  
6,962  
24  
104,840-159,008  
Access time3  
Average read (msec)  
Average write (msec)  
5.9  
6.7  
Disc rotation  
RPM  
Average latency (msec)  
10,025  
2.99  
Synchronous data transfer rate  
Maximum instantaneous (Mbytes/sec)  
40 (SE mode)  
80 (LVD mode)  
Asynchronous data transfer rate  
Maximum instantaneous (2 bytes wide)  
(Mbytes/sec)  
10.0  
Multi-segmented cache (kbytes)  
1,024 standard  
4,096 optional  
1.  
2.  
Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.  
The specified formatted capacities are calculated with the standard  
OEM sector size (512 bytes per logical block) and sparing.  
Includes on-board controller overhead.  
3.  
 
18  
Cheetah 18 Installation Guide, Rev. A  
ST118202LW/LC  
Low voltage  
Single-ended (SE)  
differential (LVD)  
mode  
mode  
DC power requirements (±5%)1  
+5 V  
+12 V  
+5 V  
+12 V  
Maximum start current  
Maximum operating current  
Average idle current  
0.89A  
0.88A  
0.72A  
2.5A  
1.22A  
0.98A  
0.90A  
0.95A  
0.74A  
2.5A  
1.22A  
0.98A  
1.  
For more detailed power information, refer to the Cheetah 18 Product  
Manual, publication number 83329260.  
 
 
Cheetah 18 Installation Guide, Rev. A  
19  
Initial setup information  
The general information beginning on this page applies to all of  
the Cheetah 18 drive models. After reading the general informa-  
tion topics, refer to the appropriate drive-specific section listed  
below for additional information about configuring and installing  
your particular model.  
Drive models  
Page  
ST118202LW  
39  
ST118202LC  
45  
General information  
The following general information topics are discussed:  
• Single-ended and low voltage differential modes  
• SCSI ID jumpers  
• Drive termination  
Terminator power  
• Interface drivers and data path width notes  
• Other applicable jumper options  
• Providing adequate cooling  
• Mounting the drive and connecting cables1  
• Formatting the drive  
1This mounting procedure does not apply to “LC” model drives.  
To mount an “LC” drive, plug the drive into the system’s single  
connector attachment (SCA) position on the system’s back  
panel.  
 
 
20  
Cheetah 18 Installation Guide, Rev. A  
Single-ended and low voltage differential modes  
This drive incorporates two different transceivers to allow you to  
use it in traditional systems which may use single-ended (SE)  
drivers and receivers, or to use it in low voltage differential (LVD)  
capable systems which use LVD drivers and receivers.  
You can configure the drive to switch between SE and LVD  
modes automatically or force it to operate in SE mode only as  
described later in this guide.  
LVD technology enhances parallel SCSI I/O performance,  
reduces power consumption, increases allowable cable lengths,  
and improves device connectivity beyond SE capabilities.  
Note.  
To operate at the Ultra2 SCSI rates in LVD mode, all  
devices on the same bus must be running in LVD mode. If  
you add any single-ended device to a bus that is operat-  
ing in LVD mode, all devices drop back to operating in  
single-ended mode. This eliminates the possibility of  
reaching Ultra2 SCSI transfer rates.  
Warning.  
Do not mix LVD drives on the same daisy chain with  
devices having high voltage differential (HVD) inter-  
face circuits.  
SCSI ID jumpers  
Each device on the SCSI chain must have a unique SCSI ID.  
The host system’s SCSI controller usually uses the ID that has  
the highest priority interrupt in the SCSI I/O system. This is  
always ID7. ID0 has the lowest priority in an 8-bit I/O system. ID8  
has the lowest priority in a 16-bit I/O system. The lower priority  
SCSI IDs are normally used for other SCSI devices such as this  
Cheetah disc drive.  
 
 
Cheetah 18 Installation Guide, Rev. A  
21  
Note. Most SCSI controllers (host adapters) allow you to skip a  
SCSI ID. For example, you can have ID0, ID1, and ID3  
(skipping ID2). Other controllers do not allow this so be  
sure to refer to your system or controller user’s manual  
for details about its requirements for proper SCSI device  
installation.  
Note. This drive is SCAM (SCSI Configured Auto Magically)  
compliant. If the system into which you are installing this  
drive requires SCAM compliant drives, you do not need  
to be concerned about the drive ID jumper settings, as  
the system automatically assigns your new drive the ID it  
wants it to have. The system may or may not use the  
existing drive ID jumper settings. Setting the drive ID  
doesn’t hurt anything, but is not necessary in a SCAM  
compliant system.  
Most Cheetah disc drives are factory set with the SCSI ID set at  
0. To change the SCSI ID, refer to the appropriate drive section  
for your model.  
If, after completing the installation process, the drive’s LED does  
not show on/off activity when the host is trying to communicate  
with the drive, a duplicate SCSI ID may be the problem. If this is  
the case, change the ID so that each device on the SCSI chain  
has its own unique ID. Also check your system or controller  
user’s manual to ensure that you have not violated its SCSI ID  
numbering recommendations.  
 
22  
Cheetah 18 Installation Guide, Rev. A  
Drive termination  
If you are installing a Cheetah drive in a system that has other  
SCSI devices installed, terminate only the end devices on the  
SCSI chain. A SCSI “device” is any disc drive, scanner, tape  
backup unit, or other piece of hardware connected to your sys-  
tem using the SCSI bus.  
Note.  
Use active (ANSI SCSI-2 Alternative 2) single-ended ter-  
minators when terminating a bus operating in single-  
ended mode. Use SPI-2-compliant active low voltage dif-  
ferential terminators when terminating a SCSI Ultra2 bus  
operating in LVD mode.  
The top example in Figure 2 shows an internal hard disc at one  
end of the SCSI bus with the SCSI controller at the other end  
(both are terminated). The bottom example shows two additional  
SCSI devices connected externally—this means the SCSI con-  
troller is no longer on the end of the SCSI chain and should not  
be terminated.  
Note.  
Some controllers prefer to remain terminated even if they  
are in the middle of the chain. Also, some controllers treat  
the internal and external chains as separate logical  
buses. This means you may need to terminate both the  
first and last devices on both logical buses to achieve  
proper termination. If necessary, refer to your system or  
controller documentation to see how this is handled in  
your particular system.  
These drives do not have on-board terminators, so you must ter-  
minate external to the drive when termination is required. For  
ST118202LC drives, this is normally accomplished by terminat-  
 
Cheetah 18 Installation Guide, Rev. A  
23  
ing the bus at the backpanel. For ST118202LW drives, use an in-  
line terminator on the cable.  
Internal SCSI cable  
Internal  
Internal  
Controller  
SCSI device SCSI device  
Terminate  
Internal SCSI cable  
External  
SCSI  
cable  
Internal  
Internal  
SCSI device SCSI device  
External  
External  
Controller  
SCSI device SCSI device  
Terminate  
Figure 2. SCSI bus termination  
Terminator power  
You usually will not need to change this option and can normally  
leave the drive configured as it was shipped from the factory. For  
information about how to change the terminator power option on  
your drive, refer to the appropriate drive-specific section.  
I/O circuits and data path widths  
• These drives can be used in single-ended or low voltage differ-  
ential interface systems; however, do not attempt to mix these  
drives on the same daisy chain with high voltage differential  
devices. The circuits are not compatible and drive damage  
may occur.  
• These drives have a “wide” (16-bit) SCSI data bus rather than  
the standard (non-wide) 8-bit SCSI data bus; however, you  
 
 
24  
Cheetah 18 Installation Guide, Rev. A  
can use these wide drives on a standard (non-wide) 8-bit data  
bus if you provide proper termination to the upper 8-bit data  
lines. This is often referred to as providing “high-9 termina-  
tion.”  
Figures 3, 4, and 5 show typical drive connections.  
The following table lists the maximum cable lengths and number  
of devices using single-ended and LVD I/O circuits allowed on a  
daisy-chain cable for 10, 20, and 40 Mtransfers/sec I/O data  
transfer rates.  
Table 1.  
Cable characteristics for SE and LVD circuits  
Maximum  
number of  
devices on  
bus  
SCSI  
driver  
type  
I/O transfer rate  
(Mtransfers/s)  
Maximum cable  
length allowed  
SE  
SE  
SE  
LVD  
10  
20  
20  
40  
16  
4
6 meters (19.7 ft.)  
3 meters (9.8 ft.)  
1.5 meters (4.9 ft.)  
12 meters (39.4 ft.)  
8
16  
A maximum of 16 devices can be connected on a 16-bit wide  
data bus.  
 
 
Cheetah 18 Installation Guide, Rev. A  
25  
Figure 3. 68-pin I/O connection to drive (LW model)  
Figure 4. 80-pin I/O connection to drive (LC model)  
 
   
26  
Cheetah 18 Installation Guide, Rev. A  
“LW” Model  
Drive  
Note:  
Terminator  
Do not mix  
“LW” and “WD”  
model drives  
on the daisy  
chain.  
[2]  
2 through X  
SCSI devices [1]  
Pin 1  
SCSI ID 1  
(check your  
adapter for Pin 1 location)  
SCSI ID 7  
Terminated  
Host Adapter  
PCB  
SCSI ID 0  
[1] “X” means up to 15 or the maximum allowable number of devices on  
the SCSI bus. See system documentation and Table 1.  
[2] External terminator. Used only on end “LW” drive. Use only SPI-2-  
compliant active LVD terminators on SCSI Ultra2 buses.  
Figure 5. Multiple-drive connection to host adapter  
 
 
Cheetah 18 Installation Guide, Rev. A  
27  
80-pin  
SCSI I/O  
Connector  
Pin 1  
J2  
J6  
Note. This drive model plugs directly into a backplane connec-  
tor and therefore does not use cables.  
Figure 6. Drive model “LC” with single 80-pin I/O and  
power connector  
 
28  
Cheetah 18 Installation Guide, Rev. A  
Providing adequate cooling  
The enclosure design must ensure adequate cooling for the  
drive. The maximum ambient temperature allowed is 50°C.  
The drive’s product manual (83329260) describes how to evalu-  
ate the air-flow design. The evaluation consists of ensuring that  
the case temperature of certain critical components remains  
within acceptable limits during drive operation.  
We recommend orienting the drive or directing the air flow in a  
way that creates the least amount of air-flow resistance while  
providing air flow above the circuit boards and around the head  
and disc assembly (HDA). Also, choose the shortest possible  
path between the air inlet and exit. This minimizes the distance  
traveled by air that is heated by the drive and by other nearby  
heat sources.  
Figure 7 shows two design approaches with one or more fans  
used to generate air flow. The air-flow patterns can be created  
by the fans either pushing or drawing air. The overall flow pattern  
can be directed from front to back, back to front, or side to side.  
 
Cheetah 18 Installation Guide, Rev. A  
29  
Kühlung des Systems  
Die Gehäusekonstruktion muß eine ausreichende Kühlung des  
Laufwerkes gewährleisten. Die Umgebungstemperatur darf max-  
imal 50°C betragen.  
Die Produkthandbuch Cheetah 18 (Dokument 83329260)  
enthalten Anweisungen zur Beurteilung der Luftstromkonstruk-  
tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse-  
temperatur bestimmter kritischer Komponenten bei  
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.  
Wir empfehlen, das Laufwerk so zu orientieren oder den Luft-  
strom so zu lenken, daß der geringste Luftstromwiderstand  
erzeugt wird und gleichzeitig ein Luftstrom über den Platinen  
und um die Kopf- und Festplatteneinheit (HDA) gegeben ist.  
Wählen Sie einen möglichst kurzen Weg zwischen Lufteinlaß  
und -auslaß. Dadurch wird die Strecke, die die vom Laufwerk  
und anderen nahegelegenen Hitzequellen aufgewärmte Luft  
zurücklegt, auf ein Minimum beschränkt.  
Abbildung 7 zeigt zwei Konstruktionsmöglichkeiten, bei denen  
ein oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstrom-  
verlauf wird durch die Lüfter gesteuert, die entweder Luft einbla-  
sen oder abziehen. Generell kann der Luftstrom entweder von  
vorne nach hinten oder von hinten nach vorne verlaufen.  
 
 
30  
Cheetah 18 Installation Guide, Rev. A  
.
Above unit  
Under unit  
Note. Air flows in the direction shown (back to front)  
or in reverse direction (front to back)  
Above unit  
Under unit  
Note. Air flows in the direction shown or  
in reverse direction (side to side)  
Figure 7. Suggested air flow  
Abbildung 7. Empfohlener Luftstromverlauf  
 
 
Cheetah 18 Installation Guide, Rev. A  
31  
Mounting the drive and connecting cables  
Do not touch the connector pins or any components on the con-  
trol board without observing static-discharge precautions.  
Always handle the drive by the frame only.  
The drive may be mounted in any orientation (horizontally, verti-  
cally, and any combination thereof); however, you must ensure  
that the drive receives adequate air flow for cooling.  
1. Mount the drive to the host system’s chassis using four 6-32  
UNC screws. Two mounting holes are in each side of the  
drive and there are four mounting holes in the bottom of the  
drive.  
The maximum length that the screws should extend into the  
chassis mounting holes is 0.15 inch (3.81 mm), measured  
from the outer surface of the chassis. Tighten the screws  
down evenly. Do not over-tighten or force the screw if it does  
not seem to screw in easily, because this means the threads  
are not properly aligned. In this case, back the screw out  
and try again.  
Installation des Laufwerkes  
und Anschluß der Kabel  
Beachten Sie beim Handhaben und Anfassen der Anschlußstifte  
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung  
statischer Aufladung. Fassen Sie das Laufwerk nur am Rahmen  
an.  
Das Laufwerk kann in beliebiger Orientierung (horizontal, ver-  
tikal oder schräg) installiert werden; jedoch muß dafür gesorgt  
werden, daß ein ausreichender Luftstrom zur Kühlung des Lauf-  
werkes vorhanden ist.  
 
 
32  
Cheetah 18 Installation Guide, Rev. A  
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben  
am Gehäuse des Host-Systems. Die beiden Seiten des  
Laufwerkes sind mit jeweils zwei Befestigungslöchern  
versehen, die Unterseite des Laufwerkes weist vier weitere  
Befestigungslöcher auf.  
Gemessen von der Außenfläche des Gehäuses dürfen die  
Schrauben maximal 3,81 mm in die Befestigungslöcher des  
Gehüuses hineinragen. Die Schrauben müssen gleich-  
mäßig, jedoch nicht zu fest, angezogen werden. Wenn sich  
eine Schraube nicht ohne Widerstand einschrauben läßt,  
sind die Gewinde nicht korrekt aneinander ausgerichtet. In  
diesem Fall die Schraube nicht in das Gewindeloch  
forcieren, sondern die Schraube herausnehmen und erneut  
in das Gewindeloch einführen.  
2. Verify that all connections between the drive and the host  
system are correctly installed.  
2. Prüfen Sie, ob alle Verbindungen zwischen dem Laufwerk  
und dem Host-System korrekt hergestellt sind.  
3. Verify that you have correctly installed jumpers.  
3. Stellen Sie sicher, daß die Kennungsbrücken installiert sind.  
4. Connect the SCSI cable into the drive’s SCSI connector.  
Take care not to stretch or crimp this cable, and do not block  
the system’s cooling air flow with the cable.  
The drive receives DC power through a 4-pin connector  
mounted next to the SCSI connector. The output of a power  
supply must meet SELV (safety extra low voltage) as  
 
Cheetah 18 Installation Guide, Rev. A  
33  
defined in IEC 950. Figure 8 provides the pin information for  
the DC power connector. To connect the DC power cable to  
the drive, simply insert the cable end into the drive’s DC  
power connector.  
4. Schließen Sie das SCSI-Kabel an den SCSI-Steckverbinder  
des Laufwerkes an. Das Kabel darf nicht gedehnt oder  
gedrückt werden und es darf den Luftstrom zur Kühlung des  
Systems nicht behindern.  
Das Laufwerk wird über einen 4-poligen, neben dem SCSI-  
Anschluß befestigten Steckverbinder mit Gleichstrom ver-  
sorgt. Der Ausgang eines Netzteils muß SELV (safety extra  
low voltage) nach IEC 950 entsprechen. Abbildung 8 zeigt  
die Steckerbelegung für den Gleichstromanschluß. Zum  
Anschluß des Gleichstromkabels an das Laufwerk das  
Kabelende in den Gleichstromanschluß des Laufwerkes  
stecken.  
Pin  
1
Power  
Pin Gleichstrom  
+12V  
1
2
3
4
+12 V  
2
+12V return  
+ 5V return  
+ 5V  
+12 V Rückleitung  
+ 5 V Rückleitung  
+ 5 V  
3
4
4
3
2
1
Figure 8. DC power connector  
Abbildung 8. Gleichstromanschluß  
 
 
34  
Cheetah 18 Installation Guide, Rev. A  
Note. Signal ground on the power control board assembly  
(PCBA) and the head and disc assembly (HDA) are con-  
nected together in this drive and you cannot separate  
them. The equipment in which you have mounted the  
drive is connected directly to the HDA and PCBA without  
electrically isolating shock mounts. Maximizing the con-  
ductive contact area between HDA ground and system  
ground may reduce radiated emissions.  
If you do not want the system chassis to be connected to  
the HDA/PCB ground, you must provide a nonconductive  
(electrically isolating) method of mounting the drive in the  
host system. This may increase radiated emissions and  
is the system designer’s responsibility.  
Hinweis.  
Die Signalerde auf der Stromregelungskarte (PCBA) und  
der Kopf- und Festplatteneinheit (HDA) sind in diesem  
Laufwerk miteinander verbunden und können nicht  
getrennt werden. Das Gerät, in das Sie das Laufwerk  
eingebaut haben, ist ohne elektrisch isolierende  
Stoßdämpfer direkt an die HDA und PCB angeschlossen.  
Die elektromagnetische Strahlung kann reduziert wer-  
den, indem Sie eine möglichst große leitende Kontak-  
fläche zwischen der HDA-Erdung und der Systemerdung  
vorsehen.  
Wenn Sie das Systemgehäuse nicht an die HDA/PCBA-  
Erdung anschließen wollen, müssen Sie das Laufwerk  
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys-  
tem einbauen. Die daraus u.U. resultierende verstärkte  
 
Cheetah 18 Installation Guide, Rev. A  
35  
elektromagnetische Strahlung fällt in den Zuständigkeits-  
bereich des Systemdesigners.  
5. Replace the host system’s cover.  
5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder  
auf.  
 
36  
Cheetah 18 Installation Guide, Rev. A  
K
//  
T
-Z-  
S
[1]  
-Z-  
H
L
J
B
R
Notes:  
Mounting holes are 6-32 UNC 2B, three  
[1]  
A
on each side and four on the bottom.  
Max screw penetration into side of drive  
is 0.15 in. (3.81 mm). Max screw  
tightening torque is 6.0 in-lb (3.32 nm)  
with minimum full thread engagement of  
0.12 in. (3.05 mm).  
-Z-  
M
U
-X-  
P
Dimension Table  
Inches  
1.654 max  
5.787 max  
Millimeters  
[1]  
G
F
A
B
C
D
E
F
G
H
J
42.01 max  
147.00 max  
101.60 ± .25  
92.25 ± .25  
3.18 ± .25  
44.45 ± .25  
41.28 ± .50  
28.50 ± .50  
101.60 ± .25  
6.35 ± .25  
41.60 ± .25  
4.60 ± .50  
4.000 ± .010  
3.750 ± .010  
.125 ± .010  
1.750 ± .010  
1.625 ± .020  
1.122 ± .020  
4.000 ± .010  
.250 ± .010  
1.638 ± .010  
.181 ± .020  
K
L
M
P
R
S
T
1.625 ± .020  
.265 ± .010  
.315 ± .040  
.015 max  
41.28 ± .50  
6.73 ± .25  
7.00 ± .10  
0.38 max  
0.38 max  
U
.015 max  
E
D
C
-X-  
Figure 9. Mounting configuration dimensions (LW model)  
 
Cheetah 18 Installation Guide, Rev. A  
37  
K
//  
T
-Z-  
S
[1]  
-Z-  
H
L
J
B
R
Notes:  
N
-Z- -X-  
Mounting holes are 6-32 UNC 2B, three  
[1]  
on each side and four on the bottom.  
Max screw penetration into side of drive  
is 0.15 in. (3.81 mm). Max screw  
tightening torque is 6.0 in-lb (3.32 nm)  
with minimum full thread engagement  
of 0.12 in. (3.05 mm).  
A
-Z-  
M
U
-X-  
Dimension Table  
Inches  
Millimeters  
P
A
B
C
D
E
F
G
H
J
1.654 max  
5.787 max  
4.000 ± .010  
3.750 ± .010  
.125 ± .010  
1.750 ± .010  
1.625 ± .020  
1.122 ± .020  
4.000 ± .010  
.250 ± .010  
1.638 ± .010  
.181 ± .020  
.040 max  
42.01 max  
147.00 max  
101.60 ± .25  
92.25 ± .25  
3.18 ± .25  
44.45 ± .25  
41.28 ± .50  
28.50 ± .50  
101.60 ± .25  
6.35 ± .25  
41.61 ± .25  
4.60 ± .50  
1.20 max  
[1]  
G
F
K
L
M
N
P
R
S
T
1.625 ± .020  
2.618 ± .010  
.276 ± .040  
.015 max  
41.28 ± .50  
66.50 ± .25  
7.00 ± 1.02  
0.38 max  
U
.015 max  
0.38 max  
E
D
C
-X-  
Figure 10. Mounting configuration dimensions (LC model)  
 
38  
Cheetah 18 Installation Guide, Rev. A  
Formatting the drive  
Warning.  
Formatting a drive erases all user data. Be sure that  
you understand this principle before formatting any  
hard disc drive. It is not necessary to format a drive  
that previously has been used to store data, unless  
your intention is to erase all user data.  
Note.  
Seagate is not responsible for lost user data.  
1. Turn on DC power.  
2. Boot the system from a system floppy disc or from a previ-  
ously installed hard disc drive if there is one.  
3. Format the disc drive. Cheetah 18 disc drives are designed  
to operate with a variety of operating systems. Please refer  
to your system or SCSI controller manual for information  
about formatting and setting up the drive. Some quick desk-  
top system notes are provided below.  
Quick reference desktop system notes  
• Hardware platform, operating system, and host adapter varia-  
tions can limit access to the full capacity of this and other high  
capacity drives. Refer to your system or utility manual for  
detailed instructions.  
• DOS/Windows 3.1/Windows 95. Set the drive type in CMOS to  
Zero,” “None,” or “No hard drive installed.” Use FDISK.EXE  
and FORMAT.EXE.  
• Macintosh. Use a third-party drive utility or Apple’s Drive Setup  
(version 1.3.1 or later) to initialize the drive. Note: versions of  
Apple Drive Setup prior to version 1.3.1 do not recognize non-  
Apple drives.  
 
Cheetah 18 Installation Guide, Rev. A  
39  
LW drives  
Setting the SCSI IDLWjumdrpiveers section  
Use the J6 connector to set the SCSI ID (see Figure 11). To  
change the SCSI ID, install jumpers as shown in the illustration.  
Drive  
Front  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
J6  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
Figure 11. Setting the SCSI ID on ST118202LW drives  
 
   
40  
LW drives  
Terminating the drive  
Cheetah 18 Installation Guide, Rev. A  
ST118202LW drives do not have internal terminators or any  
other way of adding internal termination to the drive. You must  
provide external termination to these drives when termination is  
required. This is normally done by adding an in-line terminator  
on the cable.  
Note.  
Use active (ANSI SCSI-2 Alternative 2) single-ended ter-  
minators when terminating a bus operating in single-  
ended mode. Use SPI-2-compliant active low voltage dif-  
ferential terminators when terminating a SCSI Ultra2 bus  
operating in LVD mode.  
 
Cheetah 18 Installation Guide, Rev. A  
41  
LW drives  
Terminator power  
You can configure this drive to supply termination power to the  
SCSI bus by placing a jumper on J2 pins 1 and 2. The default  
setting is no jumper, meaning that some other source (other than  
this drive) is suppling termination power to the SCSI bus.  
Pin 1  
J2  
Pin 2  
R R  
T D MW P E E T  
E S E P D S S P  
Term. Power to SCSI Bus  
Host adapter or other device provides  
term power to external terminator  
J2  
J6  
Drive  
Front  
J2 Jumper Plug  
(enlarged to  
show detail)  
Figure 12. Setting terminator power jumpers  
 
42  
LW drives  
Cheetah 18 Installation Guide, Rev. A  
Other applicable jumper options  
Several other jumper options are available as illustrated.  
Pin 1  
Pin 2  
J2  
R R  
S D MW P E E  
E S E P D S S  
T
P
Reserved  
Single-Ended Mode option  
Use single-ended or low voltage differential mode.  
Force the drive to operate only in single-ended mode.  
Delay Motor Start option  
(valid only if the Enable Motor Start jumper is not connected)  
Disable the Delay Motor Start option (default).  
Motor start delay equal to the SCSI ID multiplied by 12 seconds.  
For example, if the SCSI ID = 2, the drive starts in 24 seconds.  
Motor Start option  
Disable motor start (default). The drive starts according to the  
Delay Motor Start option.  
Enable motor start. The drive waits for the Start Unit command  
from the host before starting the spindle motor.  
Write Protect option  
Write protect = Off (enables writing – default).  
Write protect = On (disables writing).  
Parity Check option  
Enable parity check of SCSI bus (default).  
Disable parity check.  
J2  
J6  
Drive  
Front  
J2 Jumper Plug  
(enlarged to  
show detail)  
 
Cheetah 18 Installation Guide, Rev. A  
43  
LW drives  
68 Pin  
SCSI I/O Connector  
J1  
Pin 1  
J5/J1A [2][4]  
Pin 1  
4P  
3P 2P  
1P  
J1-DC Power  
Pin 12  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
J1A Pin 1  
SCSI Address A0  
SCSI Address A1  
SCSI Address A2  
SCSI Address A3  
No connection  
+5V  
Fault LED*  
Vendor Unique*  
Reserved  
Activity LED*  
Ground  
* These pins are driven low for  
250 ms after PWR ON or  
RESET to allow jumper  
selectable SCSI ID as shown  
to the right.  
Figure 13. Additional jumper options  
Figure 14. Alternate ID select and LED connection  
 
44  
LW drives  
Drive Active indicator  
Cheetah 18 Installation Guide, Rev. A  
The drive Active LED indicator connections are shown below.  
Drive  
Front  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
J6  
Reserved  
Activity LED  
Reserved  
CATH  
The shaded pins are shipped  
with a cover installed. Do not  
install jumpers on these pins.  
Retain the cover unless you  
install a 20-pin plug.  
Note: On some LEDs the flat  
side of indicator is cathode.  
Figure 15. Drive Active LED indicator connections  
 
Cheetah 18 Installation Guide, Rev. A  
45  
LC drives  
Setting the SCSI IDLCjumdrpiveers section  
The SCSI ID for ST118202LC drives is normally set over the  
SCSI bus by the host system. You can also use the J6 jumper  
block to set the SCSI ID (see Figure 16).  
Drive  
Front  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
J6  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
(default)  
Note:  
[1] Do not remove  
cover from pins  
13 through 20  
(darkened area).  
Figure 16. Setting the SCSI ID on ST118202LC drives  
 
   
46  
Cheetah 18 Installation Guide, Rev. A  
LC drives  
Terminating the drive  
LC model drives do not have internal terminators or any other  
way of adding internal termination to the drive. You must provide  
external termination to these drives when termination is  
required. Since this drive is designed to be plugged into a back-  
panel or other host enclosure without cabling, this is normally  
done by enabling termination on the backpanel or plane.  
Note.  
Use active (ANSI SCSI-2 Alternative 2) single-ended ter-  
minators when terminating a bus operating in single-  
ended mode. Use SPI-2-compliant active low voltage dif-  
ferential terminators when terminating a SCSI Ultra2 bus  
operating in LVD mode.  
Terminator power  
ST118202LC drives cannot be configured to provide termination  
power.  
 
Cheetah 18 Installation Guide, Rev. A  
47  
LC drives  
Other applicable jumper options  
Other option jumpers are available as illustrated below.  
Pin 1  
Pin 2  
J2  
R R R  
S D MW P E E  
E S E P D S S  
E
S
Reserved  
Single-Ended Mode option  
Use single-ended or low voltage differential mode.  
Force the drive to operate only in single-ended mode.  
Delay Motor Start option  
(valid only if the Enable Motor Start jumper is not connected)  
Disable the Delay Motor Start option (default).  
Motor start delay equal to the SCSI ID multiplied by 12 seconds.  
For example, if the SCSI ID = 2, the drive starts in 24 seconds.  
Motor Start option  
Disable motor start (default). The drive starts according to the  
Delay Motor Start option.  
Enable motor start. The drive waits for the Start Unit command  
from the host before starting the spindle motor.  
Write Protect option  
Write protect = Off (enables writing – default).  
Write protect = On (disables writing).  
Parity Check option  
Enable parity check of SCSI bus (default).  
Disable parity check.  
J2  
J6  
Drive  
Front  
J2 Jumper Plug  
(enlarged to  
show detail)  
Figure 17. Additional jumper options  
 
48  
Cheetah 18 Installation Guide, Rev. A  
LC drives  
Drive Active indiWcaCt/oDrC drives section  
The drive Active LED indicator connections are shown below.  
Drive  
Front  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
J6  
Reserved  
Activity LED  
Reserved  
CATH  
The shaded pins are shipped  
with a cover installed. Do not  
install jumpers on these pins.  
Retain the cover unless you  
install a 20-pin plug.  
Note: On some LEDs the flat  
side of indicator is cathode.  
Figure 18. Drive Active LED indicator connections  
 
 
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, CA 95066-4544, USA  
Publication Number: 83329250, Rev. A, Printed in USA  
 

Radio Shack Motorized Toy Car 60 4330 User Guide
Radio Shack Watch 63 5086 User Guide
RCA Washer YBXR1060 User Guide
RedMax Trimmer CHTZ2400 User Guide
Runco Computer Monitor PL 61CX User Guide
Ryobi Trimmer 767rj User Guide
Salton Blender BL 1051 User Guide
Samsung DVD Player DVD V6500 User Guide
Schneider Electric Marine Radio RS232 ASCII User Guide
SECO LARM USA Security Camera EV 2186 NKEQ User Guide