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Cheetah 4LP
••••••••••••••••••••••••••
Disc Drive
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ST34501N/W/WC/WD/DC
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Installation Guide
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Contents
Preface.........................................................................................1
Electrostatic discharge protectio 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 Systems............................................... ...... ...... .....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 4LP SCSI disc drives. It provides s upp ort services, performance specifications, and initial setup information. Additional
information is available in the
number 83329120). Contact your Seagate sales representative
if you need to order this publication.
Attention. This high performance Cheetah disc drive MUST
have proper power and cooling considerations for
reliable operatio n.
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 drive.
• 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.
Cheetah 4LP Product Ma n ual
(part
2 Cheetah 4LP Installation Guide, Rev. B
Electrostatic discharge protection
Caution.
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
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.
• Tur n off the power before removing or installing the DC power
cable.
• Do not remove any circuit board s 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.
Removal of circuit boards by personnel not performing depot repair will damage components and may
void the warranty.
Cheetah 4LP Installation Guide, Rev. B 3
Important safety information and precautions
Caution.
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 ris k of personal injury. 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.
Use forced-air ventilation when bench-testing the
drive to ensure proper cooling of drive components.
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 repairable. 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 ste ps to ensure that its products
are certifiable to currently accepted standards. Typical applications of these 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 respons ible for meeting t hese conditions of acceptabi lity 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 compon ent part and as s uch i s no t meant t o c omply
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.
Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der
Laufwerkkomponenten sicherzustellen.
Verwenden Sie geeignete Sicherheits- um den sicheren, zuverlässigen 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 vermeide n. Die Warnhinweis e machen auf Situa tionen
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 Vorsichtshinweise:
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem
Beim Testen des Laufwerks auf dem Prüftisch ist
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
höchsten ist.
• Befolgen Sie die oben unter “Electrostatic Discharge Protection” 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 vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist,
schicken Sie das gesamte Laufwerk zur Reparatur ein.
• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinandergenommen 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 Laufwerk für die Installation und
den Betrieb in Übereinstimmung mit UL 1950, EN60950, CSA
C22.2 950-M89 und VDE0805 vorgesehen.
Seagate ist ständig b emüht, die Zulassungsfähi gkeit von
Seagate-Produkten im Rahmen der gegenwärtig geltenden
Standards zu gewährleisten. Zu d en typischen Anwendungen
dieser Festplattenwerke zählen Systemeinbau durch den
Kunden und die Konstruktion von Untersystemen. Sicherheitsbehörden gewähren eine bedingte Zulassung für Komponenten
wie das Cheetah-Festplattenlaufwerk vorbehaltlich der endgültigen Zulasssung im Endprodukt. Designer von Untersystemen
sind dafür verantwortlich, die Voraussetzungen für die Einhaltung sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorgeschrieben - für die
Zulassung zu schaffen. Eine Grundvoraussetzung zur Einhaltung 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 od er äh nl ich er na tio nal er Beh örde n
für eigenständige Geräte. Technische Testergebnisse zu elektromagnetische Strahlung sind für Designer von Untersystemen
auf Anfrage von der Seagate-Sicherheitsabteilung 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
susceptibility perf ormance requirem ents . It is the respon sibil ity of
those inte grating the d rive wit hin t heir s yste ms to perfor m thos e
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 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 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 confirm 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 Marking 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 services
If you need assistance installing your drive, consult your dealer.
Dealers are familiar with their unique system configurations and
can help you wit h system confli cts and other techni cal 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 t ape drives. This s ervice is available 24 hours daily
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.seagate.com). You can also se nd E-m ai l with your quest ion s
to D iscSupport @ Se agate.com or TapeSupport @
Seagate. com .
®
drive or
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 forum provi des information similar to that 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
xxxx
configuration and drive model number (ST
Location Phone number
Australi a 61-2-9725-3366 (9:00
England 44-1628-894083 (10:00
2:00
P.M
to 5:00
.
France 33 1-41 86 10 86 (9:30
P.M
to 5:00
.
2:00
P.M
P.M
A.M
A.M
, M–F)
.
A.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
.
M–F)
Hong Kong 852-2368 9918
Korea 82-2-556-8241
Singapore 65-488-7584 (9:00
to 5:00
P.M
, M–F)
.
A.M
to 12:00
.
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
.
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
P.M. and 2:30 P.M. to 7:00
1:15
P.M
.
through Friday.
).
to 5:00
.
to 1:00
.
to 12:30
.
P.M
P.M
P.M
P.M
P.M
to 4:00
.
, 2:00
.
P.M
to 7:00
.
, M–F)
.
,
.
,
.
P.M
P.M
P.M
A.M
,
.
.
,
.
to
.
(Central time) Monday
14 Cheetah 4LP Installation Guide, Rev. B
Customer service centers
Seagate direc t OEM, Distribution , and Systems Integrat or customers should contact their Seagate service representative for
warranty information. Other custom 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 31-2031-67300 31-2065-34320
Japan 81-3-5462-2904 81-3-5462-2979
USA 1-800-468-3472 405-949-6740
Other Americas (Brazil,
Canada, Mexi co) 405-949-6706 405-949-6738
Manufacturer’s representatives
Brazil
MA Informatica 55-11-810-7794 55-21-253-6467
Canada
Memofix
Adtech
Mexico
Abicom Seamax
SA DE CV 525-546-6965 525-546-4888
905-660-4936
905-812-8099
1-800-624-9857
905-660-8738
905-812-7807
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 drive. This is ofte n a rack within the syst em or
an external enclo sure de signe d to hous e one or m ore dis c driv es
or other peri pheral unit s. In either ca se, the disc drive must
receive adequate cooling (refer to “Providing adequate cooling”)
and it must be sufficiently grounded and shielded from emissions. The
83329120) con tains guidelines for a prope rly designed
enclosure.
Cheetah 4LP Product Manual
(par t number
*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 chara cteristics
Characteristics 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%
Avg. latenc y: 2.99 msec
Seek time
2
Av erage read (typical) 7.7 msec
Average write (typical) 8.7 msec
Internal transfer rate 122 to 177 Mbits/sec
(variable with zo ne)
Multi-segmented cache 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
Table 1a. Additional drive characteristics
Legend for following table listing other drive 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 models
8, 10
+5V
Voltage regulation
Max. start current
Peak DC
Delayed motor start
(max)
3, 6, 9
1, 4
Peak operating current
Typical DC
Maximum DC
Maximum (peak) AC
1
Measured with an average reading DC ammeter. Instanta-
5
± 5% ± 5%
0.88 2.2 0.89 2.2
0.81 0.08 0.72 0.08
1
1
0.85
0.9
7
1.0
+12V
0.89
0.94
1.98
8
+5V
2
± 5% ± 5%
1.05
1.09
—
8
+12V
8
2
0.89
0.94
1.98
neous +12V current peaks will exceed these values.
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 current profil e i n th e
(publication number 83329120).
ual
4
This conditi on occurs when the Motor Star t option is enabled
Cheetah 4LP Product Ma n-
and the drive has not yet received a Start Motor command.
Cheetah 4LP Installation Guide, Rev. B 19
5
See “Conducted noise immunity” in the
Manual.
The specif ied voltage tole rance is in clusive of ri pple,
Cheetah 4LP Product
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 comm on
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.
Table 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 information
The general information 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 mounting procedure does not a pply to “WC” or “DC” model
drives. To mount a “WC” or “DC” drive, plug the drive into the
system’s single connector attachment (SCA) position on the
system’ s back panel.
1
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.
Most SCSI controllers (host adapters) allow you to skip a
Note.
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 dri ve is a SCAM ( SCSI Conf igured Auto Ma gically)
Note.
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 syste m automaticall y assigns your new d rive 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 syst em.
Most Cheetah disc drives are factory set with the SCSI ID set at
0. To change the SCSI ID, refer to the appropriate drive section
for your model .
If, after completing the installation process, the drive’s LED does
not show on/off activity when the host is trying to communicate
with the drive, a duplicate SCSI ID may be the problem. If this is
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 recommendations.
Drive termination
If you are installing a Cheetah drive in a system that has other
SCSI devices installed, terminate only the end devices on the
SCSI chain. A SCSI “device” is any disc drive, scanner, tape
backup unit, or other piece of hardware connected to your 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.
Some controllers prefer to remain terminated even if they
Note.
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.
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 b u s termina tion
Terminator power
You usually will not need to change this option and can normally
leave the drive confi gured as it was shipped from th e factory. For
information about how to change the terminator power option on
your drive, refer to the appropriate drive-specific section.
I/O circuits and data path widths
• “WD” and “DC” models use differential I/O circuits. You cannot
mix these models with single-ended models (“N,” “W,” “WC”)
on the same SCSI bus. The circuits are incompatible with
each other.
• “W,” “WD,” and “WC” models have a “wide” (16-bit) SCSI data
bus rather than the standard (non-wide) 8-bit SCSI data bus;
however, you can use these wide drives on a standard (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.
Table 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 (wide 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 of 25 meters (82 feet) is allo we d. A maximum of 8 devices
can be connected on an 8-bit wide data bus, and a maximum of
16 devices can be connected on a 16-bit wide data bus.
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
SCSI ID 1
adapter for Pin 1 location)
[2]
SCSI ID 0
SCSI ID 7
Host Adapter
PCB
[1] “X” means up to 6 or the maximum allowable number of devices on
the SCSI bus. See system documentation.
Figure 3c. Multiple drive connection to host adapter
Cheetah 4LP Installation Guide, Rev. B 27
“W” Model
SCSI ID 1
Drive
SCSI ID 0
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]
SCSI ID 7
Host Adapter
PCB
Terminator
[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. Drive 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 exit. This minimizes the distance
traveled by air that is heated by the drive and by other nearby
heat sources.
Figure 4 shows two de sign approaches with on e 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 Gehäusekonstruktion muß ein e ausreichende Kü hlung des
Laufwerkes gewährleisten. Die Umgebungstemperatur darf
maximal 50°C betragen.
Die Produkthandbuch Cheetah 4LP (Dokument 83329120)
enthalten Anwei sungen zur Beurteilung der Luft stro mkonstr uktion. Die Beurteil ung muß sicherstellen, daß sich die Gehäusetemperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.
Wir empfehlen, das Laufwerk so zu orientieren oder den Luftstrom so zu len ken, daß der ger ingste Lu ftstromwi derstand
erzeugt wird und gleichzeitig ein Luftstrom über den Platinen
und um die Kopf- und Festplatteneinheit (HDA) gegeben ist.
Wählen Sie einen mögli chst kurzen Weg zwischen Lufte inlaß
und -auslaß. Dadurch wird die St recke, 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 Luftstromverlauf wird d urc h di e L ü f te r g es t eu e rt, die e ntw ed e r Lu f t ei nblasen 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
Note. Air flows in the direction shown or
in reverse direction (side to side)
Under unit
Figure 4. Su g gested air flo w
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 syst em’s chassis using four 6-32
UNC screws. Two mounting hole s 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 moun ting holes is 0.15 inch (3.81 mm), measur ed
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 Laufwerkes vorhand en ist.
Cheetah 4LP Installation Guide, Rev. B 33
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben
am Gehäuse des Host-Systems. Die be iden Seiten des
Laufwerkes sind mit jeweils zwei Befestigungslöchern
versehen, die Unterseite des Laufwerkes weist vier weitere
Befestigungslöcher auf.
Gemessen von der Außenfläche 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 Widerstand einschrauben läß t,
sind die Gewinde nicht korrekt aneinand er au sgerich tet. 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
34 Cheetah 4LP Installation Guide, Rev. B
defined in IEC 950. Figure 5 provides the pin information for
the DC power conne ctor. To connect the DC power c able 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 we rden und es darf den Luftst rom zu r Kühl ung des
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 IEC 950 en tsprechen. Abbildung 5 ze igt
die Steckerbelegung für den Gleichstromanschluß. Zum
Anschluß des Gleichstromkabels an das Laufwerk das
Kabelende in den Gleichstromanschluß des Laufwerkes
stecken.
Pin
Pin
1
2
3
4
Power
+12V
+12V return
+ 5V return
+ 5V
Gleichstrom
1
+12 V
2
+12 V Rückleitung
3
+ 5 V Rückleitung
4
+ 5 V
4321
Figure 5. DC power connector
Abbildung 5. Gleichstromanschluß
Cheetah 4LP Installation Guide, Rev. B 35
Note. Signal ground on the power control board (PCB) and the
head and disc ass em b l y ( HDA) are connecte 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. Th is may increase radiated emis sions and
is the system designer’s responsibility.
Hinweis.
Die Signalerde auf der Stromregelungskarte (PCB) und
der Kopf- und Festplatteneinheit (H DA) sind in diesem
Laufwerk miteinander verbunden und können nicht
getrennt werden. Das Gerät, in das Sie das Laufwerk
eingebaut haben, ist ohne elektrisch isolierende
Stoßdämpfe r di rek t an di e H DA und PCB anges chl os sen.
Die elektroma gnetisch e Strahlun g kann redu zier t werden, indem Sie eine möglichst große leitende Kontakfläche zwischen der HDA-Erdung und der Systemerdung
vorsehen.
Wenn Sie das Systemgehäuse nicht an die HDA/PCBErdung anschließen wollen, müssen S ie das La ufwerk
auf nichtleitende Weise (galvanisch isoliert) im Host-System einbauen. Die daraus u.U. resultierende verstärkte
36 Cheetah 4LP Installation Guide, Rev. B
elektromagnetische Strahlung fällt in den Zuständigkeitsbereich des Systemdesigners.
5. Replace the host system’s cover.
5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder
auf.
Cheetah 4LP Installation Guide, Rev. B 37
[1]
L
A
[3]
C
F
D
.050 in. (1.27mm)
minimum clearance
[2]
J2
K
J
[4]
J6 LED
G
E
B
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.
Inches Millimeters
5.750
A
B
C
D
E
F
G
H
J
K
H
M
L
M
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.
Note.
1. Turn on DC power.
2. Boot the system from a system floppy disc or from a previ-
3. Format the disc drive. Cheetah 4LP disc drives are
Quick reference desktop system notes
Note.
• DOS. Set the drive type in CMOS to “
hard drive installe d
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).
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.
Seagate is not responsible for lost user data.
ously installed hard disc drive if there is one.
designed to operate with a variety of operating systems.
Please refer to your syst em or SCSI controller ma nual for
information about formatting and setting up the drive. Some
quick desktop system notes are provided below.
Refer to your system or utilit y manual for detailed instructions)
Zero,” “None,”
.” Use FDISK.EXE and FORMAT.EXE. Sys-
or “
No
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.
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
J2
J6 [4]
Pin 1
End
Pin 1
J6
Figure 7. Setting the SCSI ID on model “N” drives
40 Cheetah 4LP Installation Guide, Rev. B
N drives
Terminating the drive
“N” model dr ives are terminated wi th permanently moun ted IC
active ter minators. I f you insta ll one of t hese dr ives and it is not
on the end of the SCSI bus, disable the terminators by removing
the jumper
ure 8). If you install the dri ve on the end of the SCS I bus, enable
termination by i ns tal lin g a jumper on pins 1 5 a nd 16 of connector
J2.
Figure 8. Terminating the drive
from pins 15 and 16 of connector J2 (see Fig-
“TE”
J2
R
T
Enable Terminator (default)
Disable Terminator
J6
J2 Jumper
(enlarged to
show detail)
Drive
Front
TEDSMEWPP
J2
SCSI I/O
Connector
DC Power
Connector
D
Pin 1
T
E
P
P
S
2
1
J1
Pin 1
Pin 2
Cheetah 4LP Installation Guide, Rev. B 41
N drives
Terminator power
There are three possible terminator power (TP) configurations
for “N” model drives (see Figure 9). You will not normally need to
change this option and can leave the drive configured as it was
shipped from the factory.
J2
TEDSMEWPP
Term. Power from Drive (default)
Term. Power to SCSI Bus
Term. Power from SCSI Bus (position A)
Term. Power to SCSI Bus and Drive
Pin 1
J2
SCSI I/O
Connector
DC Power
Connector
J2 Jumper
(enlarged to
show detail)
J6
Drive
Front
Figure 9. Se tting termin ator po w er jumpe rs
Pin 1
Pin 2
R
T
T
E
P
P
D
S
2
1
J1
42 Cheetah 4LP Installation Guide, Rev. B
N drives
Other applicable jumper options
Several other jumper options ar e avail able as illustrated.
D
Pin 1
Pin 1
Pin 2
R
T
T
E
P
P
S
2
1
J1
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).
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
J6
J2 Jumper
(enlarged to
show detail)
Drive
Front
TEDSMEWPP
J2
SCSI I/O
Connector
DC Power
Connector
Figure 10. Additional jumper options
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 provid ed on J1 auxiliar y 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
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
J2
J6 [1]
Pin 1
Pin 1
End
J6
Note:
[1] Do not remove
cover from pins
13 through 20
(darkened area).
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
SCSI Address A0
SCSI Address A1
SCSI Address A2
SCSI Address A3
No connection
+5V
Fault LED*
Vendor Unique*
Reserved
Activity LED*
Ground*
These pins are driven low for
*
250 ms after PWR ON or
RESET to allow jumper
selectable SCSI ID as shown
to the right.
Pin 12
Pin 1
J1A Pin 1
J1A [2][4]
Pin 1
1P2P3P4P
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
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
Figure 12. Model “W” and “WD” drive alternate ID select
and LED connection
Cheetah 4LP Installation Guide, Rev. B 45
W/WD drives
Terminating the drive
“W” model drives are terminated with permanently mounted IC
active ter minators. I f you insta ll one of t hese dr ives and it is not
on the end of the SCSI bus, disable the terminators by removing
the jumper
install the drive on the end of the SCSI bus, enable termination
by installing a jumper on pins 15 and 16 of connector J2 (see
Figure 13).
Use active (ANSI SCSI-2 Alternative 2) terminators when
Note.
terminating the bus.
“WD” model drives do not have internal terminators or any other
way of adding internal termination to the drive. You must provide
external differential termination to these drives when termination
is required. See Figure 3d.
from pins 15 and 16 of connector J2. If you
“TE”
Enable Terminator (default)
Disable Terminator
J2 Jumper
(enlarged to
show detail)
J6
Drive
Front
J2
TEDSMEWPP
J2
SCSI I/O
Connector
DC Power
Connector
D
Pin 1
Pin 1
Pin 2
R
T
T
E
P
P
S
2
1
J1
Figure 13. Terminating the drive (“W” model shown)
46 Cheetah 4LP Installation Guide, Rev. B
W/WD drives
Terminator power
There are three possible terminator power (TP) configurations
for “W” model drives (see Figure 14). You will not normally need
to change this option and can leave the drive configured as it
was shipped from the factory.
There are two possible terminator power (TP) configurations for
“WD” model drives (see Figure 14).
R
E
D
S
Pin 1
Pin 1
Pin 2
T
T
P
P
2
1
J1
J2
“W” Models
Term. Power from Drive (default)
Term. Power to SCSI Bus
Term. Power from SCSI Bus (position A)
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
TEDSMEWPP
J2
SCSI I/O
Connector
DC Power
Connector
Figure 14. Setting terminator power jumpers
Cheetah 4LP Installation Guide, Rev. B 47
W/WD drives
Other applicable jumper options
Other option jumpers are available as illustrated below.
D
Pin 1
Pin 1
Pin 2
R
T
T
E
P
P
S
2
1
J1
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).
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
J6
J2 Jumper
(enlarged to
show detail)
Drive
Front
TEDSMEWPP
J2
SCSI I/O
Connector
DC Power
Connector
Figure 15. Additional jumper options
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 inter nal termination to the drive. You
must provide external 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.
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.
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.
Drive
J2 Jumper Type
(enlarged to
show detail)
Front
Figure 16. Jumper options
J2
R
ESDSMEWPP
J6
J2
SCSI I/O
Connector
DC Power
Connector
Pin 1
R
R
R
E
E
E
D
S
S
S
J1
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.
Note: On some LEDs the flat
side of indicator is cathode.
J2
Pin 1
J6
End
J6
Pin 1
CATH
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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