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Barracuda 36 Installation Guide, Rev. B
1
Preface
This manual contains information for users of the Seagate®
Barracuda 36 SCSI disc drives. It provides support services, per-
formance specifications, and initial setup information. Additional
information is available in the Barracuda 36 Product Manual
(part number 77767528). Contact your Seagate sales represen-
tative 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.
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2
Barracuda 36 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 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
stacked vertically, pay special attention to the top where tem-
peratures are usually highest.
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Barracuda 36 Installation Guide, Rev. B
3
• 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, 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 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.
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
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4
Barracuda 36 Installation Guide, Rev. B
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.
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-
shinweise:
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem
Handbuch.
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Barracuda 36 Installation Guide, Rev. B
5
• 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.
• 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.
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6
Barracuda 36 Installation Guide, Rev. B
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 Barracuda-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-
magnetische Strahlung sind für Designer von Untersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.
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Barracuda 36 Installation Guide, Rev. B
7
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
Table 2, DC power requirements.
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
shall confirm EMC compliance and provide CE Marking and
C-Tick Marking for their product.
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8
Barracuda 36 Installation Guide, Rev. B
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).
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Barracuda 36 Installation Guide, Rev. B
9
Seagate Technology support services
Online Services
Internet
For online information about Seagate products, visit
Presales Support:
email_tape_presales.shtml or
Technical Support:
®
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). This service is
available worldwide.
Automated Services
SeaFONE® (1-800-SEAGATE)
is Seagate's toll-free number (1-
800-732-4283) to access our automated self-help services.
Using a touch-tone phone, you can find answers to service
phone numbers, commonly asked questions, troubleshooting
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10
Barracuda 36 Installation Guide, Rev. B
tips and specifications for disc drives and tape drives 24 hours
daily. International callers can reach this service by dialing +1-
405-936-1234.
®
SeaFAX is Seagate's automated FAX delivery system. Using a
touch-tone phone, you can obtain technical support information
by return FAX 24 hours daily. This service is available worldwide.
Presales Support
Our Presales Support staff can help you determine which
Seagate products are best suited for your specific application or
computer system.
Seagate Express
You can purchase select tape products and tape accessories
through Seagate Express 24 hours daily by calling 1-800-531-
0968 or by faxing your order to: +1-972-481-4812.
Technical Support
If you need help installing your drive, consult your dealer. Deal-
ers are familiar with their unique system configurations and can
help you with system conflicts and other technical issues. If you
need additional help, you can talk to a Seagate technical support
specialist. Before calling, note your system configuration and
drive model number (ST####).
SeaTDD™(+1-405-936-1687) is a telecommunications device
for the deaf (TDD). You can send questions or comments 24
hours daily and exchange messages with a technical support
specialist from 8:00 A.M. to 12:15 P.M. and 1:30 P.M. to 6:00
P.M. (central time) Monday through Friday.
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Barracuda 36 Installation Guide, Rev. B
11
Customer Service (CSO)
Warranty Repair
Seagate offers worldwide customer support for Seagate drives.
Seagate direct OEM, Distribution and System Integrator custom-
ers should contact their Seagate service center representative
for warranty information. Other customers should contact their
place of purchase.
Authorized Service Centers
If you live outside the US, you can contact an Authorized Service
Center for service or repair.
USA/Canada/Latin America Support Services
Presales Support
Disc: 1-877-271-3285 or
+1-405-936-1210
FAX: +1-405-936-1683
Tape: 1-800-626-6637 or
+1-714-641-2500
FAX: +1-714-641-2410
Technical Support (SeaFONE)
1-800-SEAGATE or +1-405-936-1234 (for specific product
phone number)
FAX: Disc: +1-405-936-1685; Tape: +1-405-936-1683
SeaFAX
1-800-SEAGATE
SeaTDD
+1-405-936-1687
SeaBOARD
Disc: +1-405-936-1600; Tape: +1-405-936-1630
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Barracuda 36 Installation Guide, Rev. B
Warranty Repair
USA
1-800-468-3472
FAX: +1-405-949-6740
FAX: +1-405-949-6738
Mexico and
Latin America
+1-405-949-7758
Authorized Service Centers
Brazil
MA Informatica +55-21-516-6649
FAX: +55-21-516-5280
FAX: +1-905-660-4951
Canada
Memofix
Adtech
1
+1-905-660-4936
+1-905-812-8099 or FAX: +1-905-812-7807
1-800-624-9857
1
European Support Services
For European customer support, dial the toll-free number for
your specific country for presales support, technical support,
SeaFAX and warranty repair.
If your country is not listed here, dial our European call center at
+31-20-316-7222 from 8:30 A.M. to 5:00 P.M. (European central
time) Monday through Friday. The European call center is
located in Amsterdam, The Netherlands.
Call Center
Austria
0 800-20 12 90
0 800-74 876
80 88 12 66
0 800-90 90 52
0 800-182 6831
1 800-55 21 22
Belgium
Denmark
France
Germany
Ireland
1Authorized Service Centers
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Barracuda 36 Installation Guide, Rev. B
13
Italy
1 677 90 695
Netherlands
Norway
Poland
0 800-732 4283
800-113 91
00 800-311 12 38
900-98 31 24
Spain
Sweden
Switzerland
Turkey
0 207 90 073
0 800-83 84 11
00 800-31 92 91 40
United Kingdom 0 800-783 5177
SeaBOARD
Germany
+49-89-1409331
Fax Services—All European Countries
Presales/Technical Support/Warranty Repair +31-20-653-3513
Africa/Middle East Support Services
For presales, technical support, warranty repair and FAX ser-
vices in Africa and the Middle East, dial our European call center
at +31-20-316-7222 from 8:30 a.m. to 5:00 p.m. (European cen-
tral time) Monday through Friday, or send a FAX to +31-20-653-
3513. The European call center is located in Amsterdam, The
Netherlands.
Asia/Pacific East Support Services
Technical Support
Australia
Hong Kong
Japan
Singapore
Taiwan
+61-2-9725-3366 FAX: +61-2-9725-4052
+852-2368 9918
—
+65-488-7584
FAX: +852-2368 7173
FAX: +81-3-5462-2979
FAX: +65-488-7528
+886-2-2514-2237 FAX: +886-2-2715-2923
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14
Barracuda 36 Installation Guide, Rev. B
SeaFAX
Australia
+61-2-9756-5170
Warranty Repair
Japan
+81-3-5462-2904 FAX: +81-3-5462-2979
Asia/Pacific and +65-485-3595
Australia
FAX: +65-488-7503
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Barracuda 36 Installation Guide, Rev. B
15
General description
Barracuda 36 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 36 Product Manual (part number
77767528) contains guidelines for a properly designed
enclosure.
*
*Model “LW” version with 68-pin SCSI I/O connector
Figure 1. Barracuda 36 family drive
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16
Barracuda 36 Installation Guide, Rev. B
Drive characteristics
Table 1.
Interface
Capacity
UltraSCSI [1]
Formatted [2]
Max. data blocks
36 Gbyte [2]
71132960
Recording
Cylinders (user)
11,721
Read/write data heads 20
Access time [3]
Average read
Average write
7.6 msec
8.4 msec
Disk rotation
RPM
Average latency
7,200 r/min
4.17 msec
Internal transfer rate
(variable with zone)
137–240 Mbits/sec
Maximum synchronous SCSI transfer rate
LW/LC 80 Mbytes/sec
[1] Can also be operated according to SCSI-2 and SCSI-3 protocols.
Referred to also as “SCSI Fast-80.”
[2] Standard factory units are formatted 512 data bytes per sector with
spare tracks reserved for reallocating bad sectors.
[3] Includes controller overhead.
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Barracuda 36 Installation Guide, Rev. B
17
Table 2.
DC power requirements (Amps), multimode
(SE/LVD)
ST136475LW/LC
Voltage
+5V
+12V
Regulation [5]
±5%
±5%[2]
Max. operating current
DC [1]
1.4
1.5
0.8
Avg. idle current
DCX [1]
0.75
Max. starting current
(peak DC) [3]
(peak AC) [3]
1.05
—
2.8
4.2
Delayed motor
start (max) [1][4]
0.65
0.030
Peak operating current
Typical DCX [1][6]
Maximum DC [1]
1.05
1.4
1.3
1.5
Maximum (peak)
1.7
3.15
[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 36 Product
Manual (publication number 77767528).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
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18
Barracuda 36 Installation Guide, Rev. B
[5] See “Conducted noise immunity” in the Barracuda 36 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 Table 2.
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 simultaneously,
be sure the peak starting current is available to each device.
Table 3 shows the nominal dimensions and weight of the drive.
Table 3.
Dimensions of the drive
inches
mm
Height 1.62
Width 4.00
Depth 5.75
41.1
101.6
146.05
Weight 2.2 pounds (0.99 kilograms)
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Barracuda 36 Installation Guide, Rev. B
19
Initial setup information
The general information beginning on this page applies to all of
the Barracuda 36 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
Page
ST136475LW
39
ST136475LC
44
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 “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.
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20
Barracuda 36 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
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Barracuda 36 Installation Guide, Rev. B
21
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.
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22
Barracuda 36 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
• “LW” and “LC” models use SCSI multimode I/O circuits. Multi-
mode circuits operate either in single-ended mode or low volt-
age differential mode. No high voltage differential devices
should be connected in the I/O daisy chain with “LW” or “LC”
model drives. The state of the I/O “DIFFSNS” line determines
whether the devices on the SCSI bus operate their I/O circuits
in single-ended or low voltage differential mode. The host
device on the SCSI bus operates the “DIFFSNS” line. How-
ever, the SE jumper on J2 forces “DIFFSNS” to nominal
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Barracuda 36 Installation Guide, Rev. B
23
ground (see Figure 12). The host device cannot override the
SE jumper. If “DIFFSNS” is at nominal ground (0V to .6V), all
of the bus receivers/drivers operate in single-ended mode. If
“DIFFSNS” is between .7V and 1.9V, all bus receiver/drivers
operate in low voltage differential (LVD) mode.
• “LC” and “LW” models have a “wide” (16-bit) SCSI data bus
rather than the standard (non-wide) 8-bit SCSI data bus; how-
ever, you can use these wide drives on a standard (non-wide)
8-bit data bus. However, the unused lines must be terminated
the same as the used lines.
Figures 3a and 3b show typical drive connections. The following
tables list the maximum cable lengths and number of devices
allowed on a daisy-chain cable for I/O data transfer rates shown.
Note. For LVD operation, twisted pair cables are recom-
mended. For LVD Fast-40 operation, twisted pair cables
are strongly recommended. For Fast-80 operation,
twisted pair cables are required.
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24
Barracuda 36 Installation Guide, Rev. B
Table 4a. Cable characteristics for single-ended I/O
circuits
Maximum distance between
terminators (meters) [1] [3]
Number of attached SCSI
devices
Fast-5 Fast-10 Fast-20 Fast-40
1 to 4 maximum capacitance
(25 pF) SCSI devices
6
6
6
3
3
3
3
N/A
N/A
N/A
5 to 8 maximum capacitance
(25 pF) SCSI devices
1.5
[2]
9 to 16 maximum capacitance
(25 pF) SCSI devices
[1] For environments where all elements of the bus (cables, device inter-
faces, environmental noise and other parameters) are controlled to
be better than minimally required, it may be possible to extend the
path length and device count.
[2] Extending the device count beyond eight requires specification con-
trol beyond the minimum specified in the ANSI T10/1142D docu-
ment. It is recommended that the devices be uniformly spaced
between terminators with the end devices located as close as possi-
ble to the terminators.
[3] Values specified by data rate shall apply even if a slower data rate is
negotiated.
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Barracuda 36 Installation Guide, Rev. B
25
Table 4b. Cable characteristics for differential I/O circuits
Maximum distance between
terminators (meters) [1] [3]
Interconnect
Fast-5 Fast-10 Fast-20 Fast-40
Point-to-point interconnect
(2 devices)
25
15
25
15
25
15
25 [2]
12
Daisy-chain interconnect
(up to 16 devices) [4]
[1] For environments where all elements of the bus (cables, device inter-
faces, environmental noise and other parameters) are controlled to
be better than minimally required, it may be possible to extend the
path length and device count.
[2] SCSI devices shall be within a stub length of the termination (.1
meter).
[3] Values specified by data rate shall apply even if a slower data rate is
negotiated.
[4] Loads spaced at least eight inches (20.3 cm) apart (cables). (Refer
to SCSI EPI T10/1143D specification.)
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26
Barracuda 36 Installation Guide, Rev. B
Figure 3a. Sixty-eight pin connection to drive
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Barracuda 36 Installation Guide, Rev. B
27
“LW” Model
Drive
Note. Do not mix drives operating
single-ended with drives
operating differential on the
daisy chain.
[3]
SCSI ID X
(or last drive)
[4]
Additional
SCSI devices
Pin 1
(check your
adapter for Pin 1 location)
SCSI ID 1
SCSI ID 7
[1]
Host
Adapter
PCBA
SCSI ID 0
[3]
[2]
[1] Closed end type 68 pin connector used. Terminator required.
[2] Open end type (in-line application) connector used. No terminator.
[3] Host need not be on the end of the daisy chain. Another device can
be on the end with the terminator, the host having no terminator.
[4] Total interface cable length must not exceed that specified in ANSI
Standard X3T10/1142D (including host adapter/initiator). The cable
length restriction limits the total number of devices allowed.
[5] SCSI ID7 has highest arbitration priority. For “LW” models, priority is
ID7 to ID0, then ID15 to ID8 (ID 8 very lowest).
[6] Last drive on the daisy chain.
Figure 3b. Multiple-drive connection to host adapter
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Barracuda 36 Installation Guide, Rev. B
Note. This drive model plugs directly into a backplane connec-
tor and therefore uses no cables.
Figure 3c. Drive model “LC” with single 80-pin I/O and
power connector
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Barracuda 36 Installation Guide, Rev. B
29
Providing adequate cooling
The enclosure design must ensure adequate cooling for the
drive. The maximum ambient air temperature around the drive
should not exceed 50°C. However, to achieve maximum reliabil-
ity, the ambient temperature should be about 15°C below this
value most of the time.
The drive’s product manual (77767528) 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.
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30
Barracuda 36 Installation Guide, Rev. B
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes gewährleisten. Die Umgebungstemperatur darf max-
imal 50°C betragen.
Die Produkthandbuch Barracuda 36 (Dokument 77767528)
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.
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Barracuda 36 Installation Guide, Rev. B
31
.
Above unit
Under unit
Note. Air flows in the direction shown (front to back)
or in reverse direction (back to front)
Above unit
Under unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 4. Suggested air flow
Abbildung 4. Empfohlener Luftstromverlauf
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32
Barracuda 36 Installation Guide, Rev. B
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.
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Barracuda 36 Installation Guide, Rev. B
33
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
defined in IEC 950. Figure 5 provides the pin information for
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34
Barracuda 36 Installation Guide, Rev. B
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.
J1
Pin 1
J5
Pin 1
DC Power
4P 3P 2P 1P
PCBA
Pin Power
1
2
3
4
+12V
+12V ret
+
+
5V ret
5V
Pin Gleichstrom
1
2
3
4
+12V
+12V Rückleitung
+
+
5V Rückleitung
5V
Power
Cable
Figure 5. DC power connector
Abbildung 5. Gleichstromanschluß
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Barracuda 36 Installation Guide, Rev. B
35
Note. Signal ground on the printed circuit 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/PCBA ground, you must provide a nonconduc-
tive (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 bedruckte computerplatine mon-
tage (PCBA) und der Kopf- und Festplatteneinheit (HDA)
sind in diesem Laufwerk miteinander verbunden und kön-
nen nicht getrennt werden. Das Gerät, in das Sie das
Laufwerk eingebaut haben, ist ohne elektrisch isolier-
ende Stoßdämpfer direkt an die HDA und PCBA ange-
schlossen. Die elektromagnetische Strahlung kann
reduziert werden, indem Sie eine möglichst große lei-
tende Kontakfläche 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
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36
Barracuda 36 Installation Guide, Rev. B
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.
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Barracuda 36 Installation Guide, Rev. B
37
C
[3]
G
[1]
D
E
F
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 0.15 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).
[3] Power and interface connectors can extend past the “A” dimension
by 0.040 in. (1.02 mm).
B
[4] Centerline of pad for Pin 1 of power connector.
[5] Centerline of pad for Pin 1 of J6.
J
[6] Centerline of pad for Pin 1 of J2. Dimensions indicated are for
reference only.
[4] L
[7] Dimensions to Pin 1 of each connector are nominal values.
K
H
[8] To pin ends on J6. Pin ends on J6 are nominally flush with end of drive.
[2]
Dimension Table
Inches
Millimeters
M [6]
[6] N
J2
A
B
C
5.75 ± .025
146.05 ± .64
4.00 ± .015
101.60 ± .38
1.620
+
.027
41.1
+ .69
– .21
– .53
D
E
F
2.362 ± .010
1.120 ± .020
4.000 ± .010
.250 + .010
– .005
60.00 ± .25
28.45 ± .51
101.60 ± .25
6.35 + .25
– .12
G
S [8]
H
J
K
L
1.750 ± .010
3.750 ± .010
1.625 ± .020
.143
44.45 ± .25
95.25 ± .25
41.28 ± .51
3.63
J6
LED
M
N
P
R
S
.753
.165
.405
2.265
2.350
19.13
4.19
10.29
52.53
59.69
[7]
[7]
P [5]
R
Figure 6. Mounting configuration dimensions
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38
Barracuda 36 Installation Guide, Rev. B
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 36 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).
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Barracuda 36 Installation Guide, Rev. B
39
LW drives
Setting the SCSIWID/WjuDmdpreirvses section
Use the J6 jumper block to set the SCSI ID (Figure 7). To change
the SCSI ID, install jumpers on the appropriate pins as shown in
the illustration. Optional connections to switching circuits in host
equipment are provided on J1 auxiliary to set the SCSI ID (see
Figure 8).
Terminating the drive
“LW” model drives do not have internal terminators or any other
way of adding internal termination to the drive. External termina-
tion for these drives must be supplied by the host equipment.
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40
LW drives
Barracuda 36 Installation Guide, Rev. B
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
[1]
J6
L
E
D
R
E
S
Reserved
A
A
A
A
1 0
3
2
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
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 7. Setting the SCSI ID on model “LW” drives
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Barracuda 36 Installation Guide, Rev. B
41
LW drives
68 Pin SCSI I/O
Connector
+5V
Drive
HDA
Rear
J5
Pin 1
Ground
J1-DC Power
Pin 1
4P
(default)
3P2P
1P
J1
SCSI ID = 0
PCBA
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 8. Using J5 connector for model “LW” drive
alternate ID select and LED connection
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42
LW drives
Barracuda 36 Installation Guide, Rev. B
Other applicable jumper options
Other option jumpers are available as illustrated in Figures 9 and
10.
J2
Drive with
HDA up, PCB
down, viewed
from front
Pin 1
[1]
Pin 1
HDA
Low voltage differential
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.
[1] See Figure 10 for this jumper position option for “LW” drives.
Figure 9. Additional jumper options for “LW” drives
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Barracuda 36 Installation Guide, Rev. B
43
LW drives
Pin 1
J2
R R
S D M W P E E T
E S E P D S S P
[3]
A jumper here forces single-ended
I/O operation. [2]
No jumper allows host to select either
single-ended or LVD operation.
(default)
(default) [1]
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)
[1] “TP” not used on “LC” drives.
[2] Jumper not to be used for “LW” operation.
[3] Jumper position names shown here are not marked on the PCBA.
They are shown here for reference only.
Figure 10. Additional jumper option for “LW” drives
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44
Barracuda 36 Installation Guide, Rev. B
LC drives
Setting the SCSIWIDC/jDumCpderirvses section
The SCSI ID for “LC” 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
“LC” model drives do not have internal terminators or any other
way of adding internal termination to the drive. External termina-
tion for these drives must be supplied by the host equipment.
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Barracuda 36 Installation Guide, Rev. B
45
LC drives
Pin 1
J2
R R R
S D M W P E E E
[1]
Delay Motor Start option
E S E P D S S S
The host system has complete control over
motor start functions. Do not install a jumper
on these pins.
(default)
Enable Motor Start option
The host system has complete control over
motor start functions. Do not install a jumper
on these pins.
(default)
(default)
Write Protect option
Write protect = Off (enables writing)
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)
[1] Jumper position names shown here are not marked on the PCBA.
They are shown here for reference only.
Figure 11. Jumper options for “LC” drives
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46
Barracuda 36 Installation Guide, Rev. B
LC drives
Single-ended/low-voltage-differential selection
SE
The
and all other devices on the SCSI bus to operate in the single-
SE
jumper, when installed on J2, forces the drive I/O circuits
ended (SE) mode. When the
jumper is not on, the SCSI I/O
can operate in either single-ended or low-voltage differential
(LVD) mode, depending on which mode the host device has
SE
selected using the “DIFFSNS” I/O line. The
jumper should
not be installed unless the system documentation specifically
states that it should be installed. The I/O bus can transfer data at
a much higher data rate in the LVD mode, but the system must
be designed to accommodate a higher data rate.
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Barracuda 36 Installation Guide, Rev. B
47
LC drives
Pin 1
J2
R R R
S D M W P E E E
E S E P D S S S
[1]
Single-Ended I/O
A jumper here forces single-ended I/O
operation.
No jumper allows host to select either
single-ended or LVD operation.
(default)
J2
J6
Drive
Front
J2 Jumper Plug
(enlarged to
show detail)
[1] Jumper position names shown here are not marked on the PCBA.
They are shown here for reference only.
Figure 12. Additional jumper option for “LC” drives
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Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 77767529, Rev. B, Printed in USA
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