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Installation Guide
Barracuda 4LP Installation Guide, Rev. B
1
Preface
This manual contains information for users of the Seagate®
Barracuda 4LP SCSI disc drives. It provides support services,
performance specifications, and initial setup information. Addi-
tional information is available in the Barracuda 4LP Product
Manual (part number 77767491). 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
Barracuda 4LP Installation Guide, Rev. B
• 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
carrier 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
Barracuda 4LP Installation Guide, Rev. B
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 remove the head and disc assembly (HDA) from the
drive. 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, CSA C22.2 950-
M89, 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 Barracuda 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 overcurrent protection on drive SELV supply voltages.
4
Barracuda 4LP Installation Guide, Rev. B
This unit is a component part and as such is not meant to comply
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.
Barracuda 4LP Installation Guide, Rev. B
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 Entfernung-
sarbeiten 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
Barracuda 4LP Installation Guide, Rev. B
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerk 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, CSA
C22.2 950-M89 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. Sicherheits-
behörden gewähren eine bedingte Zulassung für Komponenten
wie das Barracuda-Festplattenlaufwerk vorbehaltlich der
endgültigen Zulasssung im Endprodukt. Designer von Untersys-
temen 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 Ein-
haltung 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-
Barracuda 4LP Installation Guide, Rev. B
7
magnetische Strahlung sind für Designer von Untersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.
European Union Compliance
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.
Seagate uses an independent laboratory to confirm compliance
to the above directives. The drive was tested in a representative
system for typical applications. The selected system represents
the most popular characteristics for test platforms. The system
configurations include:
• 486, Pentium, and PowerPC Microprocessors
• 3.5-inch Floppy Disc Drive
• Keyboard
• Monitor/Display
• Mouse
• Printer
Although the test system with this Seagate model complies to
the directives, we cannot guarantee that all systems will comply.
The computer manufacturer or system integrator shall confirm
EMC compliance and provide CE Marking for their product.
8
Barracuda 4LP Installation Guide, Rev. B
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 sup-
port services listed below.
SeaFONE® at 1-800-SEAGATE (1-800-732-4283)
Seagate’s 800 number allows toll-free access to automated self-
help services, providing answers to commonly 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. If you need to speak to a technical support
engineer, dial this number and listen to the options for technical
support. (International callers can also reach this automated
self-help service by dialing 408-456-4496).
Seagate Technology 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 on Seagate drives, Seagate
software, and much more over the Internet from Seagate’s
World Wide Web home page (http://www.seagate.com) or
Seagate’s ftp server (ftp://ftp.seagate.com).
Barracuda 4LP Installation Guide, Rev. B
9
SeaBOARD®
SeaBOARD is a computer bulletin board system (BBS) that con-
tains information about Seagate’s disc and tape drive products
and is available 24 hours daily. Set your communications soft-
ware to eight data bits, no parity, and one stop bit (8-N-1). Sea-
BOARD phone numbers are listed in the following table.
BBS Location
Modem number
United States
Disc: 408-434-1080;
Tape: 408-456-4415
England
France
44-1628-478011
33 1-48 25 35 95
49-89-140-9331
65-292-6973
662-531-8111
61-2-9756-2359
886-2-719-6075
Germany
Singapore
Thailand
Australia
Taiwan
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.
10
Barracuda 4LP Installation Guide, Rev. B
Seagate Technology 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
United States
England
Telephone number
1-800-SEAGATE or 408-456-4496
44-1628-894084
Australia
61-2-9756-5170
Seagate technical support FAX
You can FAX questions or comments to technical support spe-
cialists 24 hours daily. Responses are sent during business
hours.
Location
United States
England
France
Germany
Australia
Singapore
Hong Kong
Taiwan
FAX number
408-944-9120
44-1628-890660
33 1-46 04 42 50
49-89-1430-5100
61-2-9725-4052
65-293-4722
852-2368 7173
886-2-715-2923
82-2-556-7294/4251
Korea
Seagate technical support
You can talk to a technical support specialist during business
hours Monday through Friday for one-on-one technical help.
Barracuda 4LP Installation Guide, Rev. B
11
Before calling, note your system configuration and drive model
number (STxxxx). There are several technical support phone
numbers available for various Seagate products.
Location
Telephone number
United States
Please dial 1-800-SEAGATE for the specific
product telephone number. (6:00 A.M. to
11:15 A.M., 12:30 P.M. to 5:00 P.M., M–F)
England
France
44-1628-894083 (10:00 A.M. to 1:00 P.M.,
2:00 P.M. to 5:00 P.M., M–F)
33 1-41 86 10 86 (9:30 A.M. to 12:30 P.M.,
2:00 P.M. to 5:00 P.M., M–F)
Germany
Disc: 49-89-140-9332; Tape: 49-89-140-9333
(9:30 A.M. to 12:30 P.M., 2:00 P.M. to 4:00 P.M.,
M–F)
Australia
61-2-9725-3366
Singapore
65-290-3998 or 65-485-3998 (9:00 A.M. to
12:00 P.M., 2:00 P.M. to 5:00 P.M., M–F)
Hong Kong
Taiwan
Korea
852-2368 9918
886-2-514-2237
82-2-556-8241
SeaTDD™ 408-944-9121
Using a telecommunications device for the deaf (TDD), you can
send questions or comments 24 hours daily and exchange mes-
sages with a technical support specialist between 6:00 A.M. to
11:15 A.M. and 12:30 P.M. to 5:00 P.M. (Pacific time) Monday
through Friday.
12
Barracuda 4LP Installation Guide, Rev. B
General description
Barracuda 4LP SCSI disc drives are high-speed, random-access
digital-data storage devices.
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 Barracuda 4LP Product Manual (part number
77767491) contains guidelines for a properly designed
enclosure.
*
*Model “N” version with 50-pin SCSI I/O connector
Figure 1. Barracuda 4LP family drive
Barracuda 4LP Installation Guide, Rev. B
13
Table 1.
Interface
Drive characteristics
UltraSCSI [1]
Capacity
ST34371
ST32171
ST34571
ST32271
Formatted [2]
4.35 Gbyte [2]
2.16 Gbyte [2]
4.55 Gbyte [2]
2.26 Gbyte [2]
Unformatted
5.31 Gbyte
2.65 Gbyte
5.54 Gbyte
2.77 Gbyte
Recording
Cylinders (user)
Read/write data heads
ST32171/ST32271
ST34371/ST34571
5,178
5
10
Access time [3]
Average read
Average write
9.4 msec
10.4 msec
Disk rotation
RPM
Average latency
7,200 r/min
4.17 msec
Internal transfer rate (variable with zone)
ST32171/ST34371
ST32271/ST34571
80–122 Mbits/sec
80–126 Mbits/sec
Maximum synchronous SCSI transfer rate
N model
W/WD/WC/DC models
20 Mbytes/sec
40 Mbytes/sec
Multi-segmented cache
442 Kbytes
[1] Can also be operated according to SCSI-1 and SCSI-2 protocols.
Referred to also as “SCSI Fast-20.”
14
Barracuda 4LP Installation Guide, Rev. B
[2] Standard factory units are formatted 512 data bytes per sector with
sparing equivalent to eighty spare sectors per eight cylinder region.
Spares are located at the end of each sparing region.
[3] Includes controller overhead.
Table 2a. DC power requirements (Amps)
ST34371/ST34571
N/W/WC
WD/DC
Single-ended
Differential
Voltage
+5V
+12V
+5V
+12V
Regulation [5]
±5% ±5%[2]
±5% ±5%[2]
Max. operating current
DC3σ [1]
0.81
0.46
0.95
0.54
1.21 0.95
0.70 0.54
Avg. idle current DCX [1]
Max. starting current
(peak DC) DC3σ [3]
(peak AC) AC3σ [3]
Delayed motor start (max)
DC3σ [1][4]
0.78
0.48
2.44
3.1
1.1
2.44
3.1
0.20
0.90 0.20
Peak operating current
Typical DCX [1][6]
Maximum DC3σ [1]
Maximum (peak) 3σ
0.75
0.81
1.5
0.76
0.95
2.5
1.05 0.76
1.21 0.95
2.0
2.5
Notes for this table follows Table 2b.
Barracuda 4LP Installation Guide, Rev. B
15
Table 2b. DC power requirements (Amps)
ST32171/ST32271
N/W/WC
WD/DC
Single-ended
Differential
Voltage
+5V
+12V
+5V
+12V
Regulation [5]
±5% ±5%[2]
±5% ±5%[2]
Max. operating current
DC3σ [1]
0.81
0.46
0.85
0.52
1.21 0.85
0.70 0.52
Avg. idle current DCX [1]
Max. starting current
(peak DC) DC3σ [3]
(peak AC) AC3σ [3]
Delayed motor start (max)
DC3σ [1][4]
0.78
0.50
2.00
3.1
1.1
2.00
3.1
0.20
0.90 0.20
Peak operating current
Typical DCX [1][6]
Maximum DC3σ [1]
Maximum (peak) 3σ
0.72
0.81
1.5
0.73
0.85
2.3
0.91 0.73
1.21 0.85
2.0
2.3
[1] Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
[2] A –10% droop is permissible during initial start of the spindle
but must return to ±5% before reaching 7,200 RPM. The
±5% must be maintained after the drive signifies that its
power-up sequence has been completed and that the drive is
able to accept selection by the host initiator.
[3] See the +12V current profile in the Barracuda 4LP Product
Manual (publication number 77767491).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
16
Barracuda 4LP Installation Guide, Rev. B
[5] See “Conducted noise immunity” in the Barracuda 4LP Prod-
uct Manual. The specified voltage tolerance is inclusive of
ripple, noise, and transient response.
[6] Operating condition is defined as random seek read opera-
tions with a block count of 64.
General Notes from Tables 2a and 2b.
1. Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
2. Use separate ground returns for +5V and +12V supplies.
3. Where power is provided to multiple drives from a common
supply, carefully consider individual drive power require-
ments. Where multiple units are powered on simulta-
neously, be sure the peak starting current is available to
each device.
Table 3.
Dimensions of the drive
inches
mm
Height 1.00
Width 4.00
Depth 5.74
25.4
101.6
145.8
Weight 1.5 pounds (0.68 kilograms)
Barracuda 4LP Installation Guide, Rev. B
17
Initial setup information
The general information beginning on this page applies to all of
the Barracuda 4LP drive models. After reading the general infor-
mation topics, refer to the appropriate drive-specific section
listed below for additional information about configuring and
installing your particular model.
Drive models
ST32171N
ST34371N
Page
ST32271N
ST34571N
36
ST32171W/WD
ST34371W/WD
ST32271W/WD
ST34571W/WD
40
45
ST32171WC/DC
ST34371WC/DC
ST32271WC/DC
ST34571WC/DC
General information
The following general information topics are discussed:
• 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 “WC” or “DC” model
drives. To mount a “WC” or “DC” drive, plug the drive into the
system’s single connector attachment (SCA) position on the
system’s back panel.
18
Barracuda 4LP Installation Guide, Rev. B
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 is lowest priority in an 8-bit I/O system. ID8 is
lowest priority in a 16-bit I/O system. The lower priority SCSI IDs
are normally used for other SCSI devices such as this Barracuda
disc drive.
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 a SCAM (SCSI Configured Auto Magically)
compliant drive. 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 Barracuda disc drives are factory set with the SCSI ID set
at 0. To change the SCSI ID, refer to the appropriate drive sec-
tion 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
Barracuda 4LP Installation Guide, Rev. B
19
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.
Drive termination
If you are installing a Barracuda 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.
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.
20
Barracuda 4LP Installation Guide, Rev. B
For information about how to terminate your drive, refer to the
appropriate drive-specific section.
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
• “WD” and “DC” models use differential I/O circuits. You cannot
mix these models with single-ended models (“N,” “W,” “WC”)
on the same SCSI bus. The circuits are incompatible with
each other.
• “W,” “WD,” and “WC” models have a “wide” (16-bit) SCSI data
bus rather than the standard (non-wide) 8-bit SCSI data bus;
however, you can use these wide drives on a standard (non-
wide) 8-bit data bus.
Barracuda 4LP Installation Guide, Rev. B
21
Figures 3a, 3b, 3c, and 3d show typical drive connections. The
following table lists the maximum cable lengths and number of
devices with single-ended I/O circuits allowed on a daisy-chain
cable for <10 and <20 M transfers/sec I/O data transfer rates.
Table 4.
Cable characteristics for single-ended circuits
Maximum number of
devices on line
Maximum cable
length allowed
I/O transfer rate
<10 M transfers/s 8 (reg. SCSI bus)
<10 M transfers/s 16 (wide SCSI bus)
6 meters (19.7 ft.)
6 meters (19.7 ft.)
<20 M transfers/s 4 (reg./wide SCSI bus) 3 meters (9.8 ft.)
<20 M transfers/s 8 (reg./wide SCSI bus) 1.5 meters (4.9 ft.)
For devices having differential I/O circuits, a maximum cable
length of 25 meters (82 feet) is allowed. A maximum of 8 devices
can be connected on an 8-bit wide data bus, and a maximum of
16 devices can be connected on a 16-bit wide data bus.
22
Barracuda 4LP Installation Guide, Rev. B
HDA
Pin 1
Figure 3a. Fifty pin I/O connection to drive
HDA
Pin 1
Figure 3b. Sixty-eight pin connection to drive
Barracuda 4LP Installation Guide, Rev. B
23
“N” Model
Drive
SCSI ID X
(or last drive)
[1]
Additional
SCSI devices
Pin 1
(check your
adapter for Pin 1 location)
SCSI ID 1
SCSI ID 7
Host
Adapter
PCB
SCSI ID 0
[1] “X” means up to 6 or the maximum allowable number of devices on
the SCSI bus. See Table 4 and system documentation.
Figure 3c. Multiple drive connection to host adapter
24
Barracuda 4LP Installation Guide, Rev. B
“WD” Model
Drive [1]
“W” Model
Drive [1]
[3]
SCSI ID X
(or last drive)
[2]
Additional
SCSI devices
Pin 1
(check your
adapter for Pin 1 location)
SCSI ID 1
SCSI ID 7
Host
Adapter
PCB
SCSI ID 0
[1] Do not mix “W” and “WD” model drives on the daisy chain.
[2] “X” means up to 15 or the maximum allowable number of devices on
the SCSI bus. See Table 4 and system documentation.
[3] External terminator.
Figure 3d. Multiple-drive connection to host adapter
Barracuda 4LP Installation Guide, Rev. B
25
Note. This drive model plugs directly into a backplane connec-
tor and therefore uses no cables.
Figure 3e. Drive model “WC” or “DC” with single 80-pin I/O
and power connector
26
Barracuda 4LP Installation Guide, Rev. B
Providing adequate cooling
The enclosure design must ensure adequate cooling for the
drive. The maximum ambient temperature is 50°C.
The drive’s product manual (77767491) 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 4 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.
Barracuda 4LP Installation Guide, Rev. B
27
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes gewährleisten. Die Umgebungstemperatur darf
maximal 50°C betragen.
Die Produkthandbuch Barracuda 4LP (Dokument 77767491)
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 4 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.
28
Barracuda 4LP Installation Guide, Rev. B
.
Above unit
Über der Einheit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Under unit
Unter der Einheit
Hinweis. Luftstrom in der angezeigten Richtung
(von vorne nach hinten) oder in umgekehrter
Richtung (von hinten nach vorne)
Above unit
Über der Einheit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Under unit
Unter der Einheit
Hinweis. Luftstrom in der angezeigten Richtung oder in
umgekehrter Richtung (von Seite zu Seite)
Figure 4. Suggested air flow
Abbildung 4. Empfohlener Luftstromverlauf
Barracuda 4LP Installation Guide, Rev. B
29
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.
30
Barracuda 4LP Installation Guide, Rev. B
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
Barracuda 4LP Installation Guide, Rev. B
31
defined in IEC 950. Figure 5 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 5 zeigt
die Steckerbelegung für den Gleichstromanschluß. Zum
Anschluß des Gleichstromkabels an das Laufwerk das
Kabelende in den Gleichstromanschluß des Laufwerkes
stecken.
DC Power
Pin Power
Connector
1
2
3
4
+12V
+12V ret
+
+
5V ret
5V
4
3
2
1
Pin Gleichstrom
1
2
3
4
+12V
Power
Cable
+12V Rückleitung
+
+
5V Rückleitung
5V
Figure 5. DC power connector
Abbildung 5. Gleichstromanschluß
32
Barracuda 4LP Installation Guide, Rev. B
Note. Signal ground on the power control board (PCB) and the
head and disc assembly (HDA) are connected 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 PCB without electrically isolating
shock mounts. Maximizing the conductive 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 (PCB) 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/PCB-
Erdung anschließen wollen, müssen Sie das Laufwerk
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys-
Barracuda 4LP Installation Guide, Rev. B
33
tem einbauen. Die daraus u.U. resultierende verstärkte
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.
34
Barracuda 4LP Installation Guide, Rev. B
[4]
[3]
G
L
C
D
[1]
F
E
A
Notes:
[1] Mounting holes three on each side, 6-32 UNC.
Max screw length into side of drive 0.15 in.
(3.81 mm). Screw tightening torque 6.0 in-lb
(.675 NM) max with minimum thread
engagement of 0.12 in. (3.05 mm).
[2] Mounting holes four on bottom, 6-32 UNC.
Max screw length into bottom of drive 0.20 in.
(5.08 mm). Screw tightening torque 6.0 in-lb
(.675 NM) max with minimum thread
B
engagement of 0.12 in. (3.05 mm).
J
[3] Power and interface connectors can extend
past the "A" dimension by 0.040 in. (1.02 mm).
[4] Decorative front panel (optional).
[2]
[5] Although the illustration shows the 50 pin I/O
connector drive model, mounting hole locations
are the same for all Barracuda 4LP models.
Inches
Millimeters
H
A
B
C
5.74 ± .010
4.00 ± .010
1.00 + .021
– .009
2.362 ± .010
.620 ± .020
4.000 ± .010
.250 + .010
– .005
1.750 ± .010
3.750 ± .010
2.370 ± .020
1.00 ± .010
4.000 ± .010
0.19 ± .010
0.015 max
145.80± .25
101.60± .25
25.40+ .53
– .22
60.00± .25
15.75± .50
101.60± .25
6.35+ .25
– .12
44.45± .25
95.25± .25
60.20± .50
25.4± .25
101.6± .25
4.83± .25
0.381 max
D
E
F
K
G
H
J
K
L
M
N
P
P
N
M
[4]
Figure 6. Mounting configuration dimensions
Barracuda 4LP Installation Guide, Rev. B
35
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. Barracuda 4LP 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 desktop system notes are provided below.
Quick reference desktop system notes
Note. Refer to your system or utility manual for detailed instruc-
tions)
• DOS. Set the drive type in CMOS to “Zero,” “None,” or “No
hard drive installed.” Use FDISK.EXE and FORMAT.EXE. Sys-
tems that have operating system Windows 95 release 950B or
later do not need to partition the drive.
• Macintosh. Use a third-party drive utility (Apple’s HD Setup
utility only works with drives having special Apple firmware).
36
Barracuda 4LP Installation Guide, Rev. B
N drives
Setting the SCSI IND/NjuDmdpreivress section
Use the J6 connector to set the SCSI ID (see Figure 7). To
change the SCSI ID, install jumpers on the appropriate pins as
shown in the illustration.
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6
L
E
D
R
E
S
R
E
S
Reserved
A
A
A
0
2
1
SCSI ID = 0
(default)
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
Figure 7. Setting the SCSI ID on model N drives
Barracuda 4LP Installation Guide, Rev. B
37
N drives
Terminating the drive
“N” model drives are terminated with permanently mounted IC
active terminators. If you install one of these drives and it is not
on the end of the SCSI bus, disable the terminators by removing
the jumper “TE” from pins 15 and 16 of connector J2 (see Fig-
ure 8). If you install the drive on the end of the SCSI bus, enable
termination by installing a jumper on pins 15 and 16 of connector
J2.
Pin 1
J2
R
T D M W P E T T
E S E P D S P P
Enable SCSI terminator
Disable SCSI terminator
(default)
J2
J6
SCSI I/O
Connector
J1
Drive
Front
J2 Jumper Type
(enlarged to
show detail)
DC Power
Connector
Figure 8. Terminating the drive
38
Barracuda 4LP Installation Guide, Rev. B
N drives
Terminator power
There are three possible terminator power (TP) configurations
for “N” model drives (see Figure 9). You will not normally need to
change this option and can leave the drive configured as it was
shipped from the factory.
Pin 1
J2
R
T D M W P E T T
E S E P D S P P
“N” model drives
Term. Power from Drive
Term. Power to SCSI Bus
Term. Power from SCSI Bus
(default)
Position A
J2
J6
SCSI I/O
Connector
J1
Drive
Front
J2 Jumper Type
(enlarged to
show detail)
DC Power
Connector
Figure 9. Setting terminator power jumpers
Barracuda 4LP Installation Guide, Rev. B
39
N drives
Other applicable jumper options
Several other jumper options are available as illustrated.
Drive with
J2
HDA up, PCB
Pin 1
down, viewed
from front
Pin 1
HDA
Reserved
Delay Motor Start option
(valid only if the Enable
Motor Start jumper is
not connected)
J6
L
E
D
R
E
S
R
E
S
Reserved
A
A
A
0
2
1
Disable the Delay Motor
Start option.
(default)
Reserved
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.
11
12
Remote
LED
CATH
Shipped with cover installed.
Do not remove.
Do not install jumpers
on these four positions.
Motor Start option
Disable motor start.
The drive starts
J6
(default)
J6
according to the
Drive Front
Jumper Type
(enlarged to
show detail)
Delay Motor Start option.
Enable motor start. The
drive waits for the Start
Unit command from the
host before starting the
spindle motor.
Pin 1
End
Write Protect option
J2
Write protect = Off
(enables writing).
(default)
(default)
Pin 1
Write protect = On
(disables writing).
DC Power
Connector
Parity Check option
J1
Enable parity check of
SCSI bus.
SCSI I/O
Connector
J2 Jumper Type
(enlarged to
show detail)
Disable parity check.
Figure 10. Additional jumper options
40
W/WD drives
Barracuda 4LP Installation Guide, Rev. B
Setting the SCSIWID/WjuDmdpreivrses section
Use the J6 jumper block to set the SCSI ID (Figure 11). To
change the SCSI ID, install jumpers on the appropriate pins as
shown in the illustration. Optional connections to switching cir-
cuits in host equipment are provided on J1 auxiliary to set the
SCSI ID (see Figure 12).
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6
L
E
D
R
E
S
Reserved
A
A
A
A
0
3
2
1
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
(default)
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 model W/WD drives
Barracuda 4LP Installation Guide, Rev. B
41
W/WD drives
68 Pin SCSI I/O
Connector
+5V
Drive
HDA
Rear
J1-Auxiliary
Pin 1A
Ground
J1-DC Power
Pin 1
4P
(default)
3P2P
1P
J1
SCSI ID = 0
PCB
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
not used
Pins 1, 3, 5, and 7 are
A
A
A
A
1 0
3
2
optional connections to
switching circuits in host
equipment to establish
drive ID.
Host Alternate
Usage Plug
11
9
7
5
6
3
4
1
2
A
A
A
A
3
0
1
2
Remote Switches
12 10
8
+5V
Pins 2, 4, 6, and 8 are normally
not grounded. They are driven low
(ground) for 250 ms after a Reset or
PWR ON to allow drive to read
SCSI ID selected. Pin 8 may
also be used to drive the cathode
of an external Activity LED.
+5V
N.C.
Ground
Drive Activity LED
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
Figure 12. Using J1-Auxillary connector for model “W”
and “WD” drive alternate ID select and LED
connection
42
W/WD drives
Barracuda 4LP Installation Guide, Rev. B
Terminating the drive
“W” model drives are terminated with permanently mounted IC
active terminators. If you install one of these drives and it is not
on the end of the SCSI bus, disable the terminators by removing
the jumper “TE” from pins 15 and 16 of connector J2. If you
install the drive on the end of the SCSI bus, enable termination
by installing a jumper on pins 15 and 16 of connector J2 (see
Figure 13).
Note. Use active (ANSI SCSI-2 Alternative 2) terminators when
terminating the bus.
“WD” model drives do not have internal terminators or any other
way of adding internal termination to the drive. You must provide
external differential termination to these drives when termination
is required.
Pin 1
J2
R
T D M W P E T T
E S E P D S P P
*Enable SCSI terminator
(default)
*Disable SCSI terminator
*“W” model only
J2
J6
SCSI I/O
Connector
J1
Drive
Front
DC Power
Connector
J2 Jumper Type
(enlarged to
show detail)
Figure 13. Terminating the drive (“W” model shown)
Barracuda 4LP Installation Guide, Rev. B
43
W/WD drives
Terminator power
There are three possible terminator power (TP) configurations
for “W” model drives (see Figure 14). You will not normally need
to change this option and can leave the drive configured as it
was shipped from the factory.
There are two possible terminator power (TP) configurations for
“WD” model drives (see Figure 14).
Pin 1
J2
R
T D M W P E T T
E S E P D S P P
“W” model drives
Term. Power from Drive
Term. Power to SCSI Bus
Term. Power from SCSI Bus
(default)
(default)
Position A
“WD” model drives
Term. Power to SCSI Bus
Host adapter or other device provides
term. power to external terminator.
J2
J6
SCSI I/O
Connector
J1
Drive
Front
J2 Jumper Type
(enlarged to
show detail)
DC Power
Connector
Figure 14. Setting terminator power jumpers
44
W/WD drives
Barracuda 4LP Installation Guide, Rev. B
Other applicable jumper options
Other option jumpers are available as illustrated below.
Drive with
J2
HDA up, PCB
Pin 1
down, viewed
from front
Pin 1
HDA
Reserved
Delay Motor Start option
(valid only if the Enable
Motor Start jumper is
not connected)
J6
L
E
D
R
E
S
Reserved
A
A
A
A
0
3
2
1
Disable the Delay Motor
Start option.
(default)
Reserved
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.
11
12
Remote
LED
CATH
Shipped with cover installed.
Do not remove.
Do not install jumpers
on these four positions.
Motor Start option
Disable motor start
(default). The drive
starts according to the
Delay Motor Start option.
J6
(default)
J6
Drive Front
Jumper Type
(enlarged to
show detail)
Enable motor start. The
drive waits for the Start
Unit command from the
host before starting the
spindle motor.
Pin 1
End
Write Protect option
J2
Write protect = Off
(enables writing.
(default)
(default)
Pin 1
Write protect = On
(disables writing).
DC Power
Connector
Parity Check option
J1
Enable parity check of
SCSI bus.
SCSI I/O
Connector
J2 Jumper Type
(enlarged to
show detail)
Disable parity check.
Figure 15. Additional jumper options
Barracuda 4LP Installation Guide, Rev. B
45
WC/DC drives
Setting the SCSIWIDC/jDumCpderirvses section
The SCSI ID for “WC” and “DC” model drives is normally set
over the SCSI bus by the host system using connector contacts
39 (ID0), 40 (ID2), 79 (ID1), and 80 (ID3). Users need not install
jumpers to select SCSI ID.
Terminating the drive
“WC” and “DC” model drives do not have internal terminators or
any other way of adding internal termination to the drive. Exter-
nal termination for these drives is normally supplied by the host
equipment when termination is required.
46
Barracuda 4LP Installation Guide, Rev. B
WC/DC drives
Applicable jumper options
Option jumpers are available as illustrated below.
Pin 1
J2
R
T D M W P E T
T
Delay Motor Start option
E S E P D S P P
The host system has complete
control over motor start functions. Do
not install a jumper on these pins.
Enable Motor Start option
The host system has complete
control over motor start functions. Do
not install a jumper on these pins.
Write Protect option
Write protect = Off
(enables writing)
(default)
(default)
Write protect = On
(disables writing)
Parity Check option
Enable parity check of SCSI bus.
Disable parity check.
J2
J6
SCSI I/O
Connector
J1
Drive
Front
J2 Jumper Type
(enlarged to
show detail)
DC Power
Connector
Figure 16. Jumper options
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 77767492, Rev. B, Printed in USA
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