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Cheetah 4LP
••••••••••••••••••••••••••
Disc Drive
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ST34501N/W/WC/WD/DC
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Installa ti on Guide
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Contents
Preface.........................................................................................1
Electrostati c dis charg e protec tio n....... ...... ..... ...... ..... ...... .............2
Important safety information and precautions..............................3
Wichtige Sicherheitshinweise......................................................5
Regulatory agency compliance....................................................8
Seagate technical support services...........................................10
General description....................................................................15
Initial setup information.................................. ...... ......................20
Kühlung des Syste ms............................... ..... ...... ..... .................30
Installation des Laufwerkes und Anschluß der Kabel................32
N drives sectionb.......................................................................39
W/WD drives section..................................................................43
WC/DC drives section................................................................48
All drives (LED connections) ......................................................50
©1996, 1997 Seagate Technology, Inc. All rights reserved
Publication Number: 83329110, Rev. B
September 1997
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology, Inc. Cheetah, SeaFAX,
SeaFONE, SeaNET, SeaTDD, and SeaBOARD are either trademarks or registered trademarks of Seagate Technology, Inc. or
one of its subsidiaries. All other trademarks or registered trademarks are the property of their respective owners.
No part of this publication may be reproduced in any form without
written permission from Seagate Technology, Inc.
Cheetah 4LP Installation Guide, Rev. B 1
Preface
This manual contains information for users of the Seagate®
Cheetah 4L P SCSI di sc drives. It provi de s supp ort services, perfor mance specifications, and initial setup information. Additional
information is available in the
Cheetah 4 LP Pro du ct Ma n ual
(part
number 83329120). Contact your Seagate sales representative
if you nee d to order this publicatio n.
Attention. This high performance Cheetah disc drive MUST
have proper power and cooling considerations for
reliable operation.
Why is there a difference between 10,000 RPM and 7,200 RPM
disc drives?
• Cheetah disc drives spinning at 10,000 RPM will dissipate
more heat than 7,200 RPM class disc drives (typical power
dissipation is 22.5 watts).
• The increased heat is primarily due to increased motor power
dissipated inside the d rive.
• The increase in heat dissipation requires that the Cheetah
10,000 RPM disc drives receive more cooling consideration
than 7,200 RPM class disc drives.
• Proper consideration of enhanced cooling by conduction (heat
transfer thru material) can reduce the convection cooling (heat
transfer by air motion) requirements.
Note. Please contact Seagate technical support services or
your distributor’s technical support if you have questions.
2 Cheetah 4LP Installation Guide, Rev. B
Electrostatic discharge protection
Caution.
Removal of circuit boards by personnel not performing 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
semiconductors are extremely sensitive, all semiconductors, as
well as some resistors and capacitors, may be damaged or
degrade d 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.
• Turn off the power before removi ng 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.
Cheetah 4LP Installation Guide, Rev. B 3
Important safety information and precautions
Caution.
Use forced-air ventilation when bench-testing the
drive to ensu re proper co oling 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 injur y. The warnings
point out conditions or practices that may endanger you or others. The cautions point out conditions or practices that may damage 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 temperatures 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.
4 Cheetah 4LP Installation Guide, Rev. B
• Do not separate the head and disc assembly (HDA) from the
PCB. Return the entire drive for depot repair if the HDA is
defective.
• Do not attempt to disassemble the HDA. It is not field repair-
able. If the sealed HDA is opened by personnel not performing
depot repair, this will damage components and void the
warranty.
As a component, this drive is designed to be installed and operated in accordance with UL1950, EN60950, CSA C22.2 950M89, and VDE0805.
Seagate takes all reasonable steps to ensure that its products
are certifiable to currently accepted standards. Typical applications of thes e disc drives include customer packaging and subsystem design. Safety agencies conditionally certify component
assemblies, such as the Cheetah disc drive, based on their final
acceptability in the end-use product. The subsystem designers
are responsible for meeting these conditions of acceptability in
obtaining safety-regulatory agency compliance in their end-use
products and for certifying where required by law. A necessary
part of meeting safety requirements is the provision for overcurrent protection on drive SELV supply voltages.
This u nit is a c omponent pa rt and as suc h is not mean t t o compl y
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.
Cheetah 4LP Installation Guide, Rev. B 5
Wichtige Sicherheitshinweise
Vorsicht.
Beim Testen des Laufwerks auf dem Prüftisch ist
Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der
Laufwer kkomponenten sicherzustellen.
Verwenden Sie geeignete Sicherheits- um den sicheren, zuverlässigen Betr ieb 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 War n- 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 Beur teilung 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 Vorsichtshinweise:
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem
Handbuch.
6 Cheetah 4LP Installation Guide, Rev. B
• Treffen Sie beim Betrieb, bei der Installation oder bei der
Entfernung der Einheit angemessene Sicherheitsvorkehrungen.
• 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 Entfernungsarbeiten 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 vorgegebenen Grenzwerte nicht übersteigt. Wenn Einheiten vertikal
übereinander betestigt werden, achten Sie besonders auf den
oberen Stapelbereich, da dort die Temperatur gewöhnlich am
höchst en 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 zuständigen kann zu einer Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs führen.
• Die vor montier te Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist,
schicken Sie das gesamte Laufwerk zur Reparatur ein.
• Die HDA ist nicht vor Or t reparierbar und darf nicht auseinan-
dergenommen werden! Öffnen der versiegelten HDA durch
andere Personen als die für die werkseitige Reparatur zustän-
Cheetah 4LP Installation Guide, Rev. B 7
digen hat eine Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs zur Folge.
Als Teilkomponente ist dieses Laufwer k 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 gewähr leisten. Zu den t ypischen Anwendungen
dieser Festplattenwerke zählen Systemeinbau durch den
Kunden und die Konstruktion von Untersystemen. Sicherheitsbehörden gewähren eine bedingte Zulassung fü r Komponenten
wie das Cheetah-Festplattenlaufwerk vorbehaltlich der endgültigen Zulasssung im Endprodukt. Designer von Untersystemen
sind dafür verantwortlich, die Voraussetzungen für die Einhaltung sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorgeschrieben - für die
Zulassung zu schaf fen. Eine Grundvoraussetzung zur Einhaltung der Sicherheitsanforder ungen ist die Bereitstellung eines
Überlastschutzes für die SELV-Versorgungsspannungen des
Laufwer ks.
Dieses Gerät ist eine Baugruppe und unterliegt als solche nicht
den Anforderungen der FCC oder ähnl ich er na tio naler Behörden
für eigenständige Geräte. Techni sche Testergebnisse zu elektromagnetische Strahlung sind für Designer von Untersystemen
auf Anfrage von der Seagate-Sicherheitsabteilu ng erhältlich.
8 Cheetah 4LP Installation Guide, Rev. B
Regulatory agency compliance
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any
suscepti bility performance requiremen ts. It is the res ponsi bility of
those integra ting the d rive wit hin th eir s ystems to pe rform those
tests required and design their system to ensure that equipment
operating in the same system as the drive or external to the system does not adversely affect the perfor mance of the drive. See
Table 2, DC power requirements.
Electromagnetic compliance
Seagate us es 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 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
•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 confir m EMC compliance and provide CE Marking and CTick Marking for their product.
Cheetah 4LP Installation Guide, Rev. B 9
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European
Union requirements of the Electromagnetic Compatibility Directive 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 Mar king it complies with the Australia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).
10 Cheetah 4LP Installation Guide, Rev. B
Seagate technical support ser vices
If you need assistance installing your drive, consult your dealer.
Dealers are familiar with their unique system configurations and
can hel p you with system co nfli cts and other t echnica l issu es. If
®
you need additional assistance with your Seagate
other Seagate products, use one of the Seagate technical support services listed below.
SeaFONE® 1-800-SEAGATE
Seagate’s 800 number (1-800-732-4283) allows toll-free access
to automated self-help services, providing answers to commonly
asked questions, troubleshooting tips, and specifications for disc
drives and tape drives. This ser vice is available 24 hours daily
drive or
and requires a touch-tone phone. International callers can reach
this automated self-help service by dialing 408-456-4496.
Online services
Using a modem, you can obtain troubleshooting tips, free utility
programs, drive specifications and jumper settings for Seagate’s
entire product line. You can also download software for installing
and analyzing your drive.
SeaNET™
You can obtain technical information about Seagate products
over the Internet from Seagate’s World Wide Web home page
(http://www.seagate.com) or Seagate’s ftp server (ftp://
ftp.s eaga t e . co m ). You can also send E-mail with your questions
to DiscSupport @ Seagate.com or TapeSupport @
Seagat e . co m.
Cheetah 4LP Installation Guide, Rev. B 11
Seagate CompuServe forum
Online technical support for Seagate products is available on
CompuServe. To access our technical support forum, type
seagate
. This f orum pro vides inf ormation si milar to tha t f oun d on
go
SeaBOARD. In addition, you can type questions or browse
through previous questions and answers on the forum messages.
SeaBOARD®
SeaBOARD is a computer bulletin board system that contains
information about Seagate disc and tape drive products and is
available 24 hours daily. Set your communications software to
eight data bits, no parity, and one stop bit (8-N-1).
Location Phone number
Australia 61-2-9756-2359
England 44-1628-478011
France 33 1-48 25 35 95
Germany 49-89-140-9331
Singapore TBA
Taiwan 886-2-719-6075
Thailand 662-531-8111
USA Disc: 405-936-1600; Tape: 405-936-1630
12 Cheetah 4LP Installation Guide, Rev. B
FAX services
SeaFAX®
You can use a touch-tone telephone to access Seagate’s automated FAX system to receive technical support information by
return FAX. This service is available 24 hours daily.
Location Phone number
Australia 61-2-9756-5170
England 44-1628-894084
USA 1-800-SEAGATE or 408-456-4496
Seagate technical support FAX
You can FAX questions or comments to technical support specialists 24 hours daily. Responses are sent during business
hours.
Location Phone number
Australia 61-2-9725-4052
England 44-1628-890660
France 33 1-46 04 42 50
Germany 49-89-1430-5100
Hong Kong 852-2368 7173
Japan 81-3-5462-2979
Korea 82-2-556-7294/4251
Singapore 65-488-7528
Taiwan 886-2-715-2923
USA Disc: 405-936-1685; Tape: 405-936-1683
Cheetah 4LP Installation Guide, Rev. B 13
Direct-support services
Seagate technical support
For one-on-one help, you can talk to a technical support specialist during local business hours. Before calling, note your system
configuration and drive model number (ST
Location Phone number
A ust ra li a 61-2-9725-33 66 (9:0 0
A.M
England 44-1628-894083 (10:00
2:00
P.M
to 5:00
.
P.M
, M–F)
.
France 33 1-41 86 10 86 (9:30
2:00
P.M
to 5:00
.
P.M
, M–F)
.
to 5:00
.
A.M
A.M
xxxx
to 1:00
.
to 12:30
.
).
P.M
P.M
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)
Hong Kong 852-2368 9918
Korea 82-2-556-8241
Singapore 65-488-7584 (9:00
A.M
to 12:00
.
P.M
, 2:00
.
P.M
,
.
.
to 5:00
P.M
, M–F)
.
Taiwan 886-2-514-2237
USA Please dial 1-800-SEAGATE or 408-456-4496
for the specific product telephone number.
(8:00
A.M
to 1:15
.
P.M
, 2:30
.
P.M
to 7:00
.
P.M
,
.
Central time, M–F)
SeaTDD™ 405-936-1687
Using a telecommunications device for the deaf (TDD), you can
send questions or comments 24 hours daily and exchange messages with a technical support specialist between 8:00
1:15
P.M. and 2:30 P.M. to 7:00
P.M
(Central time) Monday
.
A.M
to
.
through Friday.
14 Cheetah 4LP Installation Guide, Rev. B
Customer service centers
Seagate direct OEM, Distribution, and Systems Integrator customers should contact their Seagate service representative for
warr anty in f ormation . Other c ustom ers sho uld co ntact th eir plac e
of purchase. Seagate offers comprehensive customer support
for all Seagate drives. These services are available worldwide.
Location Phone number FAX number
Asia Pacific and Australia 65-485-3595 65-485-4980
Europe, Middle East,
and Africa 31-2031-673 00 31-2065-34320
Japan 81-3-5462-29 04 81-3-5462-2 979
USA 1-800-468 -34 72 405-949-6740
Other Americas (Brazil,
Canada, Mexico) 405-949-670 6 405-949 -67 38
Manufacturer’s representatives
Brazil
MA Informatica 55-11-810-7794 55-21-253-6467
Canada
Memofix
Adtech
905-660-4936
905-812-8099
905-660-8738
905-812-7807
1-800-624-9857
Mexico
Abicom Seamax
SA DE CV 525-546-6965 525-546-4888
Cheetah 4LP Installation Guide, Rev. B 15
General description
Cheetah 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 dr ive. This is ofte n a rack wit hin th e system or
an e xte rnal enclosu re desi gned to h ouse on e or more disc driv e s
or other periphe ral units. In either case, t he disc dr ive must
receive adequate cooling (refer to “Providing adequate cooling”)
and it must be sufficiently grounded and shielded from emissions. The
Cheetah 4LP Product Manual
(par t number
83329120) contains guidelines for a properly designed
enclosure.
*Model “N” version with 50-pin SCSI I/O connector
Figure 1. Cheetah 4LP family drive
16 Cheetah 4LP Installation Guide, Rev. B
Table 1. Drive charac teristics
Character istics of the various drives covered by this manual are
given in the following tables.
Interface type: SCSI Fast-20 (also called
Ultra SCSI1)
Cylinders (user accessable): 6,526
Disk rotation: 10,033 r/min ±0.5%
A v g. lat enc y: 2.99 msec
Seek time
2
A verage read (typic al) 7.7 msec
Average write (typical) 8.7 msec
Internal transfer rate 122 to 177 Mbits/sec
(variable with zone)
Multi-segmented c ache 512 Kbytes
1
Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.
2
Includes on-board controller overhead.
Cheetah 4LP Installation Guide, Rev. B 17
Ta ble 1a. Additional drive characteristics
Legend for following table listing other dr ive characteristics:
A = capacity, unformatted, Gbytes
B = capacity, formatted, Gbytes
1
C = number of read/write data heads
D = max. synchronous SCSI interface transfer rate, Mbytes/sec
Model ABCD
ST34501N 6,008 4,550 8 20
ST34501W 6,008 4,550 8 40
ST34501WC 6,008 4,550 8 40
ST34501WD 6,008 4,550 8 40
ST34501DC 6,008 4,550 8 40
1
Standard OEM units formatted with 512 bytes per sector. The
drive is divided into six-cylinder-wide regions. Each region has
54 spares when formatted for 512-byte sectors.
18 Cheetah 4LP Installation Guide, Rev. B
Table 2. DC power requirements (Amps)
ST34501
N, W, WC models WD, DC m odels
Voltage regulation
+5V
5
± 5% ± 5%
8, 10
+12V
8
2
+5V
± 5% ± 5%
8
+12V
Max. start current
Peak DC
3, 6, 9
0.88 2.2 0.89 2.2
Delayed motor start
(max)
1, 4
0.81 0.08 0.72 0.08
Peak operating current
Typical DC
Maximum DC
1
1
Maximum (p eak) AC
1
Measured with an average reading DC ammeter. Instanta-
7
0.85
0.9
1.0
0.89
0.94
1.98
1.05
1.09
—
0.89
0.94
1.98
neous +12V current peaks will exceed these values.
8
2
2
A –10% tolerance is permissible during initial start of the spindle but must return to ±5% before reaching 10,000 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 c urre nt p r ofil e i n th e
(publication number 83329120).
ual
4
This condition occurs when the Motor Star t option is enabled
Cheetah 4L P Prod uc t Ma n-
and the drive has not yet received a Start Motor command.
Cheetah 4LP Installation Guide, Rev. B 19
5
See “Conducted noise immuni ty” in the
Cheetah 4LP Product
Manual .
The specified voltage tole rance is inclusive of ripple,
noise, and transient response.
6
At power-up, the motor current regulator limits the +12V current to an average value of less than value shown in table,
although instantaneous peaks may exceed this value. These
peaks should measure 5 msec duration or less.
7
Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
8
Use separate ground returns for +5V and +12V supplies.
9
Where power is provided to multiple drives from a common
supply, carefully consider individual-drive power requirements.
Where multiple units are powered on simultaneously, be sure
the peak starting current is available to each device.
10
No terminator power. See 11.7.3.4 in the
Cheetah 4LP Prod-
uct Manual.
Ta ble 3. Dimensions of the drive
in mm
Height 1.00 25.4
Width 4.00 101.6
Depth 5.75 146.05
Weight 1.3 lb (0. 59 kg)
20 Cheetah 4LP Installation Guide, Rev. B
Initial setup in formation
The general infor mation beginning on this page applies to all of
the Cheetah 4LP drive models. After reading the general information topics, refer to the appropriate drive-specific section
listed below for additional information about configuring and
installing your particular model.
Drive models Page
ST34501N 39
ST34501W/WD 43
ST34501WC/DC 48
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 cables
• Formatting the drive
1
This mountin g proc ed ure d oes not a ppl y to “W C” or “DC” m ode l
drives. To mount a “WC” or “DC” drive, plug the drive into the
1
system’s single connector attachment (SCA) position on the
system’s back pane l.
Cheetah 4LP Installation Guide, Rev. B 21
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 Cheetah
disc drive.
Note.
Note.
Most SCSI controllers (host adapters) allow you to sk ip 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.
This drive is a SCAM (SCSI Configured Auto Magical ly)
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 Cheetah disc drives are factory set with the SCSI ID set at
0. To change the SCSI ID, refer to the appropriate drive section
for your m odel.
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 dr ive, a duplicate SCSI ID may be the problem. If this is
22 Cheetah 4LP Installation Guide, Rev. B
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 recom m endations.
Drive termination
If you are installing a Cheetah dr ive 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 system 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 controller 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 ter mination. If necessary, refer to your system or
controller documentation to see how this is handled in
your particular system.
For information about how to terminate your drive, refer to the
appropriate drive-specific section.
Cheetah 4LP Installation Guide, Rev. B 23
Internal SCSI cable
Internal
SCSI device
Internal
SCSI device
Internal SCSI cable
Internal
SCSI device
Internal
SCSI device
Terminate
Controller
Terminate
Controller
External
SCSI
cable
External
SCSI device
External
SCSI device
Figure 2. SCSI bus termination
Terminator power
You usually will not need to change this option and can nor mally
leave the drive configured as it was shipped from the factory. For
infor mation 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 (nonwide) 8-bit data bus.
24 Cheetah 4LP Installation Guide, Rev. B
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 5 and 20 Mbytes/sec I/O data transfer rates.
Ta ble 4. Cable characteristics for single-ended circuits
I/O transfer
rate
Maximum number of
devices on line
Maximum cable
length allowed
5 Mbytes/s 8 (reg. SCSI bus) 6 meters (19.7 ft.)
5 Mbytes/s 16 (wide SCSI bus) 6 meters (19.7 ft.)
20 Mbytes/s 4 (reg. SCSI bus) 3 meters (9.8 ft.)
20 Mbytes/s 8 (reg. SCSI bus) 1.5 meters (4.9 ft.)
20 Mbytes/s (wid e SCSI bus)
1
See system documentation. ANSI spec does not specify a
11
value here.
For devices having differential I/O circuits, a maximum cable
length o f 25 me ters (82 feet) is allowed. A maxim um 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.
Cheetah 4LP Installation Guide, Rev. B 25
Figure 3a. 50-pin I/O connection to drive
Figure 3b. 68-pin I/O connection to drive
26 Cheetah 4LP Installation Guide, Rev. B
“N” Model
Drive
2 through X SCSI devices [1]
Pin 1
(check your
adapter for Pin 1 location)
SCSI ID 1
[2]
SCSI ID 0
SCSI ID 7
Host Adapter
PCB
[1] “X” means up to 6 or the maximum allowable num ber of devic es on
the SCSI bus. See system documentation.
Figure 3c. Multiple drive connection to host adapter
Cheetah 4LP Installation Guide, Rev. B 27
“W” Model
Drive
SCSI ID 1
2 through X
SCSI devices [1]
“WD” Model
Drive
Note:
Do not mix
“W” and “WD”
model drives
on the daisy
chain.
Pin 1
(check your
adapter for Pin 1 location)
[2]
Terminator
SCSI ID 7
Host Adapter
SCSI ID 0
PCB
[1] “X” means up to 15 or the maximum allowable number of devices on
the SCSI bus. See system documentation and Table 4.
[2] External terminator. Used only on end “WD” drive.
Figure 3d. Multiple-drive connection to host adapter
28 Cheetah 4LP Installation Guide, Rev. B
80-pin
SCSI I/O
Connector
Pin 1
J2
J6
Note. This drive model plugs directly into a backplane connec-
tor and therefore uses no cables.
Figure 3e. Driv e model “WC” or “DC” with single 80- pin I/O
and power connector
Cheetah 4LP Installation Guide, Rev. B 29
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 (83329120) describes how to evaluate 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 ex it. 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.
30 Cheetah 4LP Installation Guide, Rev. B
Kühlung des Systems
Die Gehäusekonstr uktion muß eine ausr eichende Kü hlung des
Laufwerkes gewährleisten. Die Umgebungstemperatur darf
maximal 50°C betragen.
Die Produkthandbuch Cheet ah 4LP (Dokument 83329120)
enthalten An weisun gen z ur Be ur te ilung der Luft stro mkonstr uktion. Die Beur teil ung muß sicherstellen, daß sich die Gehäusetemperatur bestimmter kritischer Komponenten bei
Laufwer kbetrieb innerhalb zugelassener Grenzen hält.
Wir empfehlen, das Laufwerk so zu orientieren oder den Luftstrom s o zu lenken, daß de r gerings te Luftst romwiderst and
erze ugt wird und gleichzeitig ein Luftstrom über den Platinen
und um die Kopf- und Festplatt eneinheit (HDA) geg eben ist.
Wählen Si e einen möglichst kurzen Weg zwischen Lufteinl aß
und -auslaß. Dadu rch 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 Luftstromverlau f w ird d ur c h di e L üf te r gesteue rt , die e nt wed e r Lu ft ei nbla sen oder abziehen. Generell kann der Luftstrom entweder von
vorne nach hinten oder von hinten nach vorne verlaufen.
Cheetah 4LP Installation Guide, Rev. B 31
.
Above unit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Above unit
Under unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 4. Suggested air flow
Abbildung 4. Empfohlener Luftstromverlauf
Under unit
32 Cheetah 4LP Installation Guide, Rev. B
Mounting the drive and connecting cables
Do not touch the connector pins or any components on the control board without observing static-discharge precautions.
Always handle the drive by the frame only.
The drive may be mounted in any orientation (horizontally, vertically, 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, vertikal oder schräg) installiert werden; jedoch muß dafür gesorgt
werden, daß ein ausreichender Luftstrom zur Kühlung des Laufwerke s vorhanden ist.
Cheetah 4LP Installation Guide, Rev. B 33
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben
am Gehäuse des Ho st-Systems. Die beiden Sei ten des
Laufwerkes sind mit jeweils zwei Befestigungslöchern
versehen, die Unterseite des Laufwerkes weist vier weitere
Befestigungslöcher auf.
Gemessen von der Außenfläch e des Gehäuse s dürfen die
Schrauben maximal 3,81 mm in die Befestigungslöcher des
Gehüuses hineinragen. Die Schrauben müssen gleichmäßig, jedoch nicht zu fest, angezogen werden. Wenn sich
eine Schraube nicht ohne Wide rstand einschrauben läßt,
sind die Gewinde n icht korre kt anei nander au sger ichtet. 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 insta lled.
2. Prüfen Sie, ob alle Verbindungen zwischen dem Laufwerk
und dem Host-System korrekt hergestellt sind.
3. Veri fy that you have correctly installed j umpers.
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
34 Cheetah 4LP Installation Guide, Rev. B
defined in IEC 950. Figure 5 provides the pin information for
the DC power conn ector. To con nect 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 Laufwer kes an. Das Kabel darf nicht gedehnt oder
gedrückt werden und es da rf den Luftstrom zur Kühl un g de s
Systems nicht behindern.
Das Laufwerk wird über einen 4-poligen, neben dem SCSIAnschluß befestigten Steckverbinder mit Gleichstrom versorgt. Der Ausgang eines Netzteils muß SELV (safety extra
low voltage) nach IE C 950 entsp rechen. Abbildung 5 zeigt
die Steckerbelegung für den Gleichstromanschluß. Zum
Anschluß des Gleichstromkabels an das Laufwerk das
Kabelende in den Gleichstr omanschluß des Laufwer kes
stecken .
Pin
1
2
3
4
Power
+12V
+12V return
+ 5V return
+ 5V
Pin
1
2
3
4
Gleichstrom
+12 V
+12 V Rückleitung
+ 5 V Rückleitung
+ 5 V
Figure 5. DC power connector
Abbildung 5. Gleichstromanschluß
4321
Cheetah 4LP Installation Guide, Rev. B 35
Note. Signal ground on the power control board (PCB) and the
head and di sc as s em b l y ( HDA) are conne cte d to get her i n
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 Stromregelungskar te (PCB) und
der Kopf- und Festplattenei nheit (HDA) sind in diesem
Laufwerk miteinander verbunden und können nicht
getrennt werden. Das Gerät, in das Sie das Laufwer k
eingebaut haben, ist ohne elektrisch isolierende
Stoßdämp fer direkt an di e HDA und PCB ang es chl os se n.
Die ele ktromagnet ische Stra hlung kann reduzier t wer den, indem Sie eine möglichst große leitende Kontakfläche zwischen der HDA-Erdung und der Systemerdung
vorsehen.
Wenn Sie das Systemgehäuse nicht an die HDA/PCBErdung a nschließen wolle n, müssen S ie das La ufwerk
auf nichtleitende Weise (galvanisch isoliert) im Host-System einbauen. Die daraus u.U. resultierende verstär kte
36 Cheetah 4LP Installation Guide, Rev. B
elektromagnetische Strahl ung fällt in den Zuständigkeitsbereich des Systemdesigners.
5. Replace the h ost system’s cover.
5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder
auf.
Cheetah 4LP Installation Guide, Rev. B 37
[1]
A
[3]
L
C
F
D
G
E
.050 in. (1.27mm)
minimum clearance
B
[2]
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 (1.02mm).
[4]
Decorative front panel.
K
J
[4]
J2
J6 LED
H
M
A
B
C
D
E
F
G
H
J
K
L
M
Inches Millimeters
5.750
4.000
1.000
0.625
4.000
0.250
2.375
3.750
2.370
1.750
1.100
4.100
±
0.010
±
0.010
+
0.026
–
0.010
±
0.020
±
0.005
±
0.005
±
0.010
±
0.010
±
0.010
±
0.020
±
0.010
±
0.010
Figure 6. Mounting configuration dimensions
146.05
101.60
25.40
15.87
101.60
6.35
60.32
95.25
60.20
44.45
27.94
104.14
±
.25
±
.25
±
.38
±
.50
±
.13
±
.13
±
.25
±
.25
±
.25
±
.50
±
.25
±
.25
38 Cheetah 4LP Installation Guide, Rev. B
Formatting the drive
Warning.
For matting a dr ive 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 eras e 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 previously installed hard disc drive if t here is one.
3. Format the disc drive. Cheetah 4LP disc drives are
designed to operate with a variety of operating systems.
Please refer to your system or SCSI controller manual for
infor mation 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 manua l for detailed instructions)
• DOS. Set the drive type in CMOS to “
hard driv e instal led
.” Use FDISK.EXE an d F ORMAT.EXE. Sys-
Zero,” “None,”
or “
No
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).
Cheetah 4LP Installation Guide, Rev. B 39
N drives
N drives sectionbSetting the SCSI ID jumpers
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.
J2
Jumper Plug
(enlarged to
show detail)
Pin 1
End
J6
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
J6 [4]
Pin 1
Figure 7. Setting the SCSI ID on mode l “N” drives
40 Cheetah 4LP Installation Guide, Rev. B
N drives
Terminating the drive
“N” model drives are terminated with permanently mounted IC
active te rmi nators. If you install o ne of the se dr ives and it is not
on the end of the SCSI bus, disable the ter minators by removing
the jumper
“TE”
from pins 15 and 16 of connector J2 (see Figure 8). If yo u install the drive on the end of the SCSI bus, enable
termination by installin g a j um per on pins 15 and 16 of c onn ec tor
J2.
Pin 1
Enable Terminator (default)
Disable Terminator
J2 Jumper
(enlarged to
show detail)
J6
Drive
Front
J2
TEDSMEWPP
D
Pin 1
J2
SCSI I/O
Connector
R
E
S
T
P
Pin 2
T
P
2
1
J1
Figure 8. Terminating the drive
DC Power
Connector
Cheetah 4LP Installation Guide, Rev. B 41
N drives
Terminator power
There are three possible terminator power (
) configurations
TP
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
Term. Power from Drive (default)
Term. Power to SCSI Bus
Term. Power from SCSI Bus (position A)
Term. Power to SCSI Bus and Drive
TEDSMEWPP
D
Pin 1
R
E
S
T
P
2
Pin 2
T
P
1
J2
J2 Jumper
(enlarged to
show detail)
J6
Drive
Front
SCSI I/O
Connector
DC Power
Connector
Figure 9. Setting terminator po wer jumpe rs
J1
42 Cheetah 4LP Installation Guide, Rev. B
N drives
Other applicable jumper options
Several other jumper options are avail able as il lustrated.
J2
Reserved
Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.
For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option
Disable motor start (default). The drive starts according to the
Delay Motor Start option.
Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.
Write Protect option
Write protect = Off (enables writing – default).
TEDSMEWPP
Pin 1
R
E
D
S
Pin 2
T
T
P
P
2
1
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
J6
J2 Jumper
(enlarged to
Drive
Front
show detail)
Figure 10. Additional jumper options
Pin 1
J2
SCSI I/O
Connector
DC Power
Connector
J1
Cheetah 4LP Installation Guide, Rev. B 43
W/WD drives
W/WD drives sectionSetting the SCSI ID jumpers
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 circuits in host equipment are provided on J1 auxiliary to set the
SCSI ID (see Figure 12).
Jumper Plug
(enlarged to
show detail)
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
J2
J6 [1]
Pin 1
Pin 1
End
J6
Note:
[1] Do not remove
cover from pins
13 through 20
(darkened area).
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” and “WD”
drives
44 Cheetah 4LP Installation Guide, Rev. B
W/WD drives
68 Pin
SCSI I/O Connector
J1
Pin 1
J1A [2][4]
Pin 1
1P2P3P4P
Pin 12
SCSI Address A0
SCSI Address A1
SCSI Address A2
SCSI Address A3
No connection
+5V
Fault LED*
Vendor Unique*
Reserved
Activity LED*
Ground*
J1A Pin 1
J1-DC Power
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
These pins are driven low for
*
250 ms after PWR ON or
RESET to allow jumper
selectable SCSI ID as shown
to the right.
Figure 12. Model “W” and “WD” drive alternate ID select
and LED connection
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
Cheetah 4LP Installation Guide, Rev. B 45
W/WD drives
Terminating the drive
“W” model drives are terminated with permanently mounted IC
active te rmi nators. If you install o ne of the se dr ives and it is not
on the end of the SCSI bus, disable the ter minators by removing
the jumper
“TE”
from pins 15 and 16 of connector J2. If you
install the dr ive 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
ex ternal differential termination to these drives when termination
is required. See Figure 3d.
Pin 1
J2
TEDSMEWPP
D
R
E
S
P
Pin 2
T
T
P
2
1
Enable Terminator (default)
Disable Terminator
J2 Jumper
(enlarged to
show detail)
Figure 13. Terminating the drive (“W” model shown)
J6
Drive
Front
Pin 1
J2
SCSI I/O
Connector
DC Power
Connector
J1
46 Cheetah 4LP Installation Guide, Rev. B
W/WD drives
Terminator power
There are three possible terminator power (
) configurations
TP
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 ter minator power (
) configurations for
TP
“WD” model drives (see Figure 14).
Pin 1
J2
“W” Models
Term. Power from Drive (default)
Term. Power to SCSI Bus
Term. Power from SCSI Bus (position A)
TEDSMEWPP
D
R
E
S
T
P
2
Pin 2
T
P
1
Term. Power to SCSI Bus and Drive
“WD” Models
Term. Power to SCSI Bus (default)
Host adapter or other device provides
term. power to external terminator.
J6
J2 Jumper
(enlarged to
show detail)
Drive
Front
Pin 1
J2
SCSI I/O
Connector
DC Power
Connector
J1
Figure 14. Setting terminator power jumpe rs
Cheetah 4LP Installation Guide, Rev. B 47
W/WD drives
Other applicable jumper options
Other option jumpers are available as illustrated below.
J2
Reserved
Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.
For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option
Disable motor start (default). The drive starts according to the
Delay Motor Start option.
Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.
Write Protect option
Write protect = Off (enables writing – default).
TEDSMEWPP
Pin 1
R
E
D
S
Pin 2
T
T
P
P
2
1
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
J6
J2 Jumper
(enlarged to
Drive
Front
show detail)
Figure 15. Additional jumper options
Pin 1
J2
SCSI I/O
Connector
DC Power
Connector
J1
48 Cheetah 4LP Installation Guide, Rev. B
WC/DC drives
WC/DC drives sectionSetting the SCSI ID jumpers
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).
Terminating the drive
“WC” and “DC” model drives do not have internal terminators or
any other way of adding internal termination to the drive. You
must provide exter nal termination to these drives when termination is required.
Cheetah 4LP Installation Guide, Rev. B 49
WC/DC drives
Applicable jumper options
Option jumpers are available as illustrated below.
Pin 1
J2
R
ESDSMEWPP
Delay Motor Start option
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.
D
R
E
S
R
E
S
R
E
S
Write Protect option
Write protect = Off
(enables writing – default)
Write protect = On
(disables writing)
Parity Check option
Enable parity check of SCSI bus
(default).
Disable parity check.
J6
Drive
Front
J2
SCSI I/O
Connector
J1
J2 Jumper Type
(enlarged to
show detail)
Figure 16. Jumper options
DC Power
Connector
50 Cheetah 4LP Installation Guide, Rev. B
All drives
All drives (LED connections)Drive Active indicator
The drive Active LED indicator connections are shown below.
Jumper Plug
(enlarged to
show detail)
Reserved
Activity LED
Reserved
The shaded pins are shipped
with a cover installed. Do not
install jumpers on these pins.
Retain the cover unless you
install a 20-pin plug.
J2
J6
Pin 1
Pin 1
End
J6
CATH
Note: On some LEDs the flat
side of indicator is cathode.
Figure 17. Drive Active LED indicator connections
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83329110, Rev. B, Printed in USA
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