Seagate Elite ST43400N, Elite ST43400ND User Manual

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Elite Disc Drive

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ST43400N/ND

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User ’s Manual

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ii

Contents

Preface .................................................................................................... iii

Electrostatic discharge protection........................................................ iii

Important safety information and precautions...................................... iv

Technical support services.................................................................. vi

Section 1. General description ................................................................ 1

Section 2. Installation .............................................................................. 7

Section 3. Operation ............................................................................... 33

Section 4. Parts data............................................................................... 37

Section 5. Maintenance........................................................................... 39

© 1992 Seagate Technology, Inc. All rights reserved
Publication Number: 83327630, Rev. A
Seagate®, Seagate Technology®, and the Seagate logo are registered

trademarks of Seagate Technology, Inc. Elite
SeaBOARDTM are trademarks of Seagate Technology, Inc. Other product
names are registered trademarks or trademarks of their owners.

No part of this publication may be reproduced in any form without written
permission from Seagate Technology, Inc.

TM,

SeaFAXTM, SeaFONETM, and

ST43400N/ND User’s Manual iii

Preface

This manual contains information for users of the Seagate ST43400N and
ST43400ND Elite disc drives employing the SCSI interface. It provides instal­lation, operation, and maintenance information. This manual also lists the part
numbers for options and accessories available for these drives. Additional
information is available in the reference manual (publication 83327640).

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 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 (refer to accessories
in Section 4 for part numbers). 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 removing or installing the DC power cable.

• Do not remove any circuit boards from the drive.

• Never use an ohmmeter on any circuit boards.

iv

Important safety information and precautions

Caution. Use forced-air ventilation when bench-testing the drive to ensure

proper cooling of drive components.

Use proper safety and repair techniques for safe, reliable operation of this unit.
Service should be done only by qualified persons. We recommend the proce­dures in this manual as effective ways of servicing the unit. Some procedures
require the use of special tools. For proper maintenance and safety, you must
use these tools as recommended.

The procedures in this manual and labels on the unit contain warnings and
cautions that must be carefully read and followed to minimize or eliminate the
risk of personal injury. The warnings point out conditions or practices that may
endanger you or others. The cautions point out conditions or practices that may
damage the unit, possibly making it unsafe for use.

You must also understand that these warnings and cautions are not exhaustive.
We cannot possibly know, evaluate, and advise you of all the ways in which
maintenance might be performed or the possible risk of each technique.
Consequently, we have not completed any such broad evaluation. If you use a
non-approved procedure or tool, first ensure that the method you choose will not
risk either your safety or unit performance.

Always observe the following warnings and precautions:

• Perform all maintenance by following the procedures in this manual.

• Follow all cautions and warnings in the procedures.

• Use sound safety practices when operating or repairing the unit.

• Use caution when troubleshooting a unit that has voltages present. Turn off
power to the unit before servicing it.

• Wear safety shoes when removing or replacing heavy parts.

• Provide a means to isolate the drive from the main power in case of fire or other
emergency.

• 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 chassis. 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.

ST43400N/ND User’s Manual v

• Do not remove the head and disc assembly (HDA) from the drive chassis.
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, IEC950, EN60950, CSA C22.2 950, and VDE0806.
Refer to section 2 for information about installation.

If you do not use a Seagate power supply, ensure that the supply meets the
specifications in this manual and is designed to be used in accordance with
UL1950, IEC950, EN60950, CSA C22.2 950, and VDE0806.

Seagate takes all reasonable steps to ensure that its products are certifiable to
currently accepted standards. Typical applications of these disc drives include
customer packing and subsystem design. Safety agencies conditionally certify
component parts, such as the Elite disc drive, based on their final acceptability
in the end-use product. The subsystem designers are responsible for meeting
these conditions of acceptability in obtaining safety/regulatory agency compli­ance in their end-use products and for certifying where required by law. A
necessary part of meeting safety requirements is the provision for overcurrent
protection on drive SELV supply voltages.

This unit is a component assembly and as such is not meant to comply with FCC
or similar national requirements as a stand-alone unit. Engineering radiated and
conducted emissions test results are available through the Seagate Safety
Department to assist the subsystem designer.

vi

Technical support services

Seagate Technology provides technical support literature and diagnostic utili­ties to authorized distributors. Please contact your dealer for technical support
and installation troubleshooting. Product technical support is available for all
Seagate products by calling the SeaFAX, SeaFONE, or SeaBOARD services.
These are toll calls if you dial from outside of the number’s local dialing area.

SeaFAX: [phone]

You can use a Touch-Tone telephone to access Seagate’s automated FAX
delivery system and select technical support information by return FAX. This
service is available twenty-four hours a day, seven days a week.

SeaFONE: [phone]

The enhanced phone system provides recorded technical information on
selected Seagate products while you are on hold. Technical support specialists
are available to answer questions from 8:00 A.M. to 5:00 P.M. PST, Monday
through Friday. Recordings are accessible twenty-four hours a day, seven days
a week.

SeaBOARD:

The Seagate Technical Support Bulletin Board System (BBS) is available
twenty-four hours a day, seven days a week. A modem is required to access this
service. The communications software must be set for eight data bits no parity
and one stop bit (8N1). With this service you can access:

• Specifications and jumper configurations for all Seagate products

• Reprints of Seagate documentation

• A directory of information and helpful utilities that you can download to your
own computer

Location Telephone Number Maximum Baud Rate

United States/Canada [phone] 9600
England 44-62-847-8011 9600
Germany 49-89-140-9331 2400
Singapore 65-227-2217 9600
Australia 61-2-756-2359 9600
Note. This is a toll call if you dial from outside of the number’s local dialing area.

Section 1. General description

The Seagate ST43400N/ND Elite 3 disc drives are high speed, random access
digital data storage devices. They communicate with an initiator using the Small
Computer System Interface (SCSI). The drive is shown in Figure 1, and its
specifications are listed in Table 1 on the following page.

The drive is a component for installation in an enclosure designed for the drive.
The enclosure design must ensure adequate cooling for the drive, and it must
address the requirements for grounding and for shielding of emissions. The
reference manual (publication 83327640) presents guidelines for designing the
enclosure, but the design is your responsibility.

1

Spindle Sync

Option

Jumpers

I/O

Connector

Head and Disc

Assembly (HDA)

Connector

Option

Jumpers

Pin 1

DC Power
Connector

Control

Board

Option

Jumpers

Power

Board

Optional

Bezel

Chassis

Figure 1. The ST43400N/ND disc drive

2

Table 1. Drive specifications
Characteristics Conditions Specifications

Size Dimensions See “Space requirements”

in section 2
Weight (drive only) 3.6 kg (8.0 lb)
Weight (power supply only) 2.3 kg (5.0 lb)

Interface Fast SCSI-2
Recording Total capacity 3,554,871,600 bytes

(unformatted)
Bytes per track

(unformatted)

Inner track 49,000 bytes
Outer track 72,800 bytes

Formatted capacity*

(256-byte sectors) 2,538,290,688 bytes
(512-byte sectors) 2,916,687,360 bytes

(1,024-byte sectors) 3,150,686,208 bytes
Number of discs 11
Recording heads 21
Servo heads 1
Physical heads per surface 1
Cylinders per head/disc assy 2,738 (includes 2 spares)
Cylinders available to user 2,736
Spare cylinders 1
System cylinders 1
Diagnostic cylinders 1
Spare sectors per cylinder 6
Modulation 1,7 code

* Excluding spare sectors, spare cylinders, diagnostic cylinders, and system cylin-

ders.

continued

General description 3

continued from previous page

Characteristics Conditions Specifications

SCSI transfer rate, burst 10.0 Mbytes/sec max
Seek time

(time required to move heads
to a different track address—
excluding SCSI I/O overhead)

Typical full 23.5 msec
Typical average 11.5 msec
Typical one-track 1.7 msec

Typical access times Write Read

Typical single track
seek msec 1.7 0.9

Average seek msec 11.5 10.5
Maximum seek msec 23.5 22.5

Latency
(time required to reach a
particular track address after
head positioning is complete)

Average 5.55 msec

(disc rotation
at 5400 RPM)

Maximum 11.17 msec

(disc rotation
at 5373 RPM)

Start time** 30 sec max
Stop time 30 sec max

** Following the power sequence delay, once DC power is applied and start

conditions are present.

4

The drive contains all the circuits and mechanical devices necessary to record
data on and recover it from its discs. The drive requires DC voltage input from
an external power supply, which receives its AC input power from the site main
power source. A power supply and DC power cable are available accessories.

The drive consists of a head and disc assembly (HDA) and two circuit boards,
mounted on a common chassis. The circuit boards contain the electronics
required for drive operation. The HDA is a sealed unit containing the electrome­chanical components used for data retrieval and storage. These components
include the discs, spindle, drive motor, actuator, heads, and preamplifiers.

The 11 discs provide the recording medium for the drive. These discs are
mounted on a spindle, and the spindle is coupled directly to the drive motor. The
drive motor rotates the discs at 5400 RPM and produces a circulation of air
within the sealed HDA.

The built-in SCSI controller directs all drive functions, receives commands
from the initiator (host computer), interprets them, and then transfers the
necessary commands to the drive. The controller therefore allows the
initiator to start an operation and then disconnect to service another device.
Refer to the reference manual for a description of interface functions.

All drive operations are related to data recovery and storage (normally referred
to as reading and writing). The actual reading and writing is performed by heads
that are positioned over the rotating discs’ recording surfaces. There is one
head for each data surface. The heads are positioned in such a way that data
is written in concentric tracks around the disc surfaces (see Figure 2).

Before any read or write operation can be performed, the controller must
instruct the drive to position the heads over the desired cylinder (called
seeking) and to use the head located over the surface (head selection) where
the operation is to be performed.

The heads are mounted on the actuator, and the actuator moves the heads over
the rotating discs. There are 22 heads; a servo head to sense actuator
positioning and 21 data heads used for data transfers to and from the discs. The
actuator has a voice coil that moves in a permanent magnetic field in response
to signals from the servo positioning circuitry. The voice coil moves the heads in
an arc across the rotating discs.

When the drive is not powered on, the heads rest on the disc surface in a
preassigned landing zone located beyond the data zone. The actuator automati­cally latches in this position to protect the drive in the event that it is moved or
shipped. When the drive is activated to bring the discs up to speed, the heads
fly on a cushion of air close to the disc surface.

General description 5

Data recorded in
concentric tracks

Head

Selection

Logic

Heads

Discs

Power Supply

Initiator

I/0 Lines

SCSI

Controller

Unit

Selection

Logic

Read/Write

Logic

Seek
Logic

Track

Orientation

Logic

Error

Detection

Logic

Figure 2. Drive functional block diagram

After arriving at the data track and selecting a head, the controller locates the
portion of the track where the data is to be read or written. This is called track
orientation. Signals from the drive indicate the beginning of each track. The
controller uses these signals to determine the position of the head on the track.

When the head is above the desired track location, the controller commands the
drive to actually read or write the data. During a read operation, the drive
retrieves data from the discs, processes it, and transmits it to the controller.
During a write operation, the drive receives data from the controller, processes
it, and stores it on the discs.

The drive can also recognize certain errors that may occur during its
operation. When an error is detected, it is indicated to the initiator by the SCSI
controller.

Section 2. Installation

The information contained in this section describes installation and initial
checkout of the drive.

Site requirements

The site requirements considered are environment, airflow, space, power,
grounding, and interface.

Environmental requirements

All environmental requirements for the drive are listed in Table 2 below.

Table 2. Drive environmental requirements
Conditions Specifications

Operating environment

Temperature Range of 5

maximum change of 20oC (36oF) per hour

Humidity Range of 5% to 95% relative

A maximum wet bulb temperature of 26
no condensation

Barometric pressure -305 m to 3,048 m (-1,000 ft to 10,000 ft);

104 kPa to 69 kPa (30 in Hg to 20 in Hg)

o

C to 50oC (41oF to 122oF) with a

o

C (79oF)

7

Non-operating environment
(unpacked)

Temperature Range of -40oC to 60oC (-40oF to 140oF) with a

maximum change of 20oC (36oF) per hour

Humidity Range of 5% to 95% relative

A maximum wet bulb temperature of 26
no condensation

Barometric pressure -305 m to 12,192 m (-1,000 ft to 40,000 ft);

104 kPa to 19 kPa (30 in Hg to 6 in Hg)

Storage/transit environment
(packed)

Temperature Range of -40

o

C to 60oC (-40oF to 140oF) with a

maximum change of 20oC (36oF) per hour
Humidity Range of 5% to 95% relative
Barometric pressure -305 m to 12,192 m (-1,000 ft to 40,000 ft);

104 kPa to 19 kPa (30 in Hg to 6 in Hg)

o

C (79oF)

8

Airflow requirements

The enclosure design must ensure adequate cooling for the drive. Note that the
fan in the power supply cools only the power supply’s internal parts.

The drive’s product specification (document 64403601) describes how to
evaluate the airflow design. The evaluation consists of ensuring that the case
temperatures of certain critical components remain within acceptable limits
during drive operation.

We recommend orienting the drive or directing the airflow in a way that creates
the least amount of airflow resistance while providing airflow 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 3 shows two design approaches with one or more fans used to
generate air flow. The airflow 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.

Installation 9

Above unit

Note. Air flow in the direction shown (front to back)
or in reverse direction (back to front)

Note. Air flow in the direction shown or
in reverse direction (side to side)

Under unit

Above unit

Under unit

Figure 3. Suggested airflow

10

Space requirements

The drive is designed to be mounted in one of the three orientations shown
in Figure 4. The drive may be mounted on its base or on either side. Mounting
orientations other than those shown are not permitted. The physical dimen­sions of the drive and power supply are shown in Figure 5. The drive itself
weighs 3.6 kg (8.0 lb).

For details about designing an enclosure to match the drive mounting dimen­sions, refer to the drive’s product specification.

Up

Up

Figure 4. Mounting orientations

Up

Installation 11

Drive

83 mm

3.25 in

204.72 mm

147 mm

5.75 in

8.06 in max

Power Supply

70 mm

2.75 in

141 mm

5.57 in

Figure 5. Dimensions of the drive and power supply

202 mm

8.00 in

12

Power requirements

The voltage and current requirements for a single drive at cylinder 0 are shown
in Table 3.

Table 3. Single drive voltage and current requirements

Current without Internal Current with Internal

Terminator Terminator

Seeking Contin- Seeking Contin-

and uous and uous

Voltage Idle Reading Reading Idle Reading Reading

SCSI single-ended interface

+5 V 1.87A 1.91 A 2.00A 1.90A 1.96 A 2.09A
+12V 1.57 A 1.92 A 1.56A 1.57A 1.90A 1.56 A
Watts 28.19W 32.59 W 28.72W 28.34W 32.60 W 29.17W

SCSI differential interface

+5 V 2.32A 2.63 A 2.75A 2.45A 2.77A 2.85A
+12V 1.63 A 1.88 A 1.64A 1.63A 1.88A 1.66A
Watts 31.21W 35.71 W 33.40W 31.81W 36.41 W 34.17W

Without Internal With Internal

Terminator Terminator

Maximum Current Limits +5 V +12 V +5 V +12 V

SCSI single-ended interface

Maximum operating current* 2.06A 3.09 A 2.37A 3.04A
Average idle current 1.84 A 1.92 A 1.96A 1.92A
Maximum starting current* 2.06A 3.98A 2.37A 3.98A
Maximum seek current* 1.89A 2.12A 2.16A 3.19A

SCSI differential interface

Maximum operating current* 2.98A 2.88A 3.48A 3.17A
Average idle current 2.11 A 1.85 A 2.45A 1.63A
Maximum starting current* 2.98A 3.98A 3.48A 4.60A
Maximum seek current* 2.31A 2.13A 3.48A 3.17A

*Instantaneous +12 V current peaks will exceed these values by up to 0.8 A.

Installation 13

AC power requirements for the optional Seagate power supply are listed in
Table 4 below. Conversion to the different line voltages is explained in the
installation procedures.

Table 4. Power supply AC power requirements

Nominal Values

Specifications 100–120 VAC 208–240 VAC

Voltage range 85 to 132 V 175 to 264 V
Nominal line frequency 50/60 Hz 50/60 Hz
Frequency range 48.0 to 62.0 Hz 48.0 to 62.0 Hz
Phase requirements Single phase Single phase
Power consumed* 71.5 W 69.5 W
Line current* 0.90 A 0.50 A
Power factor* 0.55 0.47
*Measured at nominal values when discs are rotating and carriage is track-following.

Grounding requirements

A safety ground must be provided by the site AC power system. The green wire
(or green wire with yellow stripe) in the AC power cord provides the safety ground
connection between the power supply and the site AC power system. The site
AC power system must provide the safety ground to earth ground connection.

All site AC power connection points, including convenience outlets for test
equipment, must be maintained at the same safety ground potential.

Interface requirements

An important part of site preparation is planning the layout and routing of I/O
cables. All drives and other SCSI devices are connected together and to the
host with an I/O cable. The SCSI bus can have up to eight devices attached to
it as shown in Figure 6. The I/O cabling scheme used is called a daisychain.
Each end of the SCSI bus must be terminated.

14

Term

SCSI

Device

0

SCSI

Device

1

SCSI

Device

2

SCSI

Device

3

Figure 6. SCSI bus configuration

Term

SCSI

Device

7

SCSI

Device

6

SCSI

Device

5

SCSI

Device

4

A connector (J06) at the back of the drive accepts the I/O cable that connects
it to the system. The daisychain cable is a continuous unshielded cable having
one connector for each drive it connects to.

Refer to the reference manual (publication 83327640) for guidelines on I/O
cabling. These guidelines discuss the use of unshielded cabling inside cabinets
and shielded cabling running between cabinets. They also contain information
about constructing continuous daisychain cabling (including part numbers for
the required cabling components).

Table 5 on the following page shows the pin assignments and signal names for
the unshielded single-ended I/O cable. Table 6 shows the pin assignments and
signal names for the unshielded differential I/O cable. Detailed information about
interface lines is provided in the reference manual.

Installation 15

Table 5. Unshielded single-ended I/O cabling

Signal Name Pin Number

DB- (0) 2
DB- (1) 4
DB- (2) 6
DB- (3) 8
DB- (4) 10
DB- (5) 12
DB- (6) 14
DB- (7) 16
DB- (P) 18
GROUND 20
GROUND 22
GROUND 24
TERMPWR 26
GROUND 28
GROUND 30
ATN- 32
GROUND 34
BSY- 36
ACK- 38
RST- 40
MSG- 42
SEL- 44
C/D- 46
REQ- 48
I/O- 50

Notes:

1. All odd pins except 25 must be connected to ground. Pin 25 is open.

2. A minus sign indicates active low.

16

Table 6. Unshielded differential I/O cabling

Signal Name Pin Number Pin Number Signal Name

(GROUND) 1 2 GROUND
DB(0) 3 4 DB- (0)
DB(1) 5 6 DB- (1)
DB(2) 7 8 DB- (2)
DB(3) 9 10 DB- (3)
DB(4) 11 12 DB- (4)
DB(5) 13 14 DB- (5)
DB(6) 15 16 DB- (6)
DB(7) 17 18 DB- (7)
DB(P) 19 20 DB- (P)
DIFFSENS 21 22 GROUND
GROUND 23 24 GROUND
TERMPWR 25 26 TERMPWR
GROUND 27 28 GROUND
ATN 29 30 ATN­GROUND 31 32 GROUND
BSY 33 34 BSY­ACK 35 36 ACK­RST 37 38 RST­MSG 39 40 MSG­SEL 41 42 SEL­C/D 43 44 C/D­REQ 45 46 REQ­I/O 47 48 I/O­GROUND 49 50 GROUND

Installation 17

Unpacking, inspection, and repacking

After removing the packing material, inspect the drive for shipping damage.
Save all packing materials for future use.

The drive is shipped separately from any other items ordered for the installation.

Unpacking

1. Allow the drive temperature to approach the ambient temperature of the
unpacking area. Ensure that the temperature stabilization period meets the
requirements printed on the drive container.

2. Open the package and remove the drive from its conductive static shielding
bag, using the precautions described in the preface.

3. Check all items against the shipping bill for required equipment and hard­ware to complete installation. Discrepancies, missing items, damaged
equipment, etc., should be reported to the sales representative from whom
the drive was purchased.

Inspection

Inspect the drive for possible shipping damage. All claims for shipping damage
should be filed with the carrier involved.

Repacking

If it is necessary to ship the drive, repack the drive with the original packing
materials (saved during unpacking). Refer to section 5 for instructions.

18

Installation procedures

With the site requirements completed, the enclosure designed, and the drive
unpacked, you are ready to begin the installation. The following procedures are
included in drive installation:

• Setting the control board jumpers

• Installing the power supply

• Attaching an optional bezel

• Mounting the drive

• Connecting the system I/O cabling

• Grounding the system

• Synchronizing the spindle

Setting the control board jumpers
Caution. Do not remove the control board to set jumpers.

The control board on the drive contains a number of jumpers that must be set
correctly for normal operation of the drive. Figure 7 identifies jumpers, gives their
locations on the control board, and lists the possible settings for normal drive
operation.

Installation 19

4

3

Terminator Resistor-Paks

(must be installed if drive is at

either end of daisychain)

ID2
ID1

SCSI Selectors
ID0
Write Protect (WP)
Master/Slave (MS)

J4A

Select SCSI ID, write protect, and
master/slave options by placing
jumpers as shown below.

SCSI ID = 0

SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

Write Protect = On
(prevents writing)

Write Protect = Off
(enables writing)

Master drive for spindle sync

Slave drive unless selected as the
master by a SCSI command

ID1 WP

ID2 ID0

2

Assign the terminal power jumpers as shown below.
Initiator supplies power over the SCSI bus source for

terminators. Drive supplies no terminator power.
Drive supplies power for its own terminator resistor-paks but

not to the SCSI bus (factory setting).
Drive supplies power for the external terminator at the end of

the daisychain. Terminator resistor-paks must be removed.

MS

Spinup Delay option (SD)
Immediate spinup

(if the Start Command option jumper is disconnected)
Spinup delay equal to the SCSI bus ID multiplied by 10 seconds

(if the Start Command option jumper is disconnected)

Start Command option (SC)
Start spindle according to the Spinup Delay option jumper

Spindle spinup is delayed until a Start Unit command is
received from the SCSI bus

SCSI bus parity check (PAR)
Enable parity check of SCSI bus data

Ignore parity

Sweep Cycle option (SWP)
Disable sweep cycles (recommendation — sweep cycles

should be enabled at the system or subsystem level)

Enable sweep cycles at the drive level

Terminator Power Source Jumper

1

Recommended only for the last drive on the daisychain.

*

Spinup Delay option (SD)
Start Command option (SC)
SCSI Bus Parity Check option (PAR)
Sweep Cycle option (SWP)

J4B

4
2

*

SD PAR

3
1

SC SWP

Figure 7. Control board jumpers

20

Installing the power supply

A power supply and AC power cord are available if desired. The power supply
is configured before shipment to operate in one of two AC input voltage ranges.
The voltage select plate on the power supply (see Figure 8) indicates the factory­preset voltage range. You may change the voltage range by setting the voltage
select switch to the desired range.

Setting the voltage range
Caution. The power supply will be damaged if the voltage select is set for the

low range (100–120 VAC) and a voltage in the high range (208–240
VAC) is applied.

1. Ensure that the AC power cable is disconnected from the power supply.

2. To change the voltage range, perform the following steps:
a. Remove the screw that secures the voltage select plate to the power

supply and remove the plate from the power supply. Retain the plate and

all hardware.
b. Set the voltage select switch to the desired range.
c. Reverse the voltage select plate and install the plate on the power supply

to lock the switch in the desired range.
d. Replace the existing AC power cable with the AC power cable specified

for the new operating voltage. Refer to section 4 for information about

ordering a replacement AC power cord.

Mounting the power supply
Note. The mounting screw threads must be completely engaged in the power

supply chassis but must not exceed the limits given in the next step.

1. Select mounting screws that meet the following criteria for insertion depth:

• For bottom mounting—2.8 to 6.4 mm (0.110 to 0.250 in)

• For side mounting—5.0 mm (0.2 in) maximum

2. Mount the power supply in the desired location with four 6-32 screws. Use
the tapped mounting holes in the bottom of the power supply or in the sides
of the power supply.

3. Connect a ground strap between the chassis safety ground screw on the
power supply and the cabinet ground.

4. Attach the AC power cord to the power supply connector J1. Do not connect
the power cord to site power until directed.

Installation 21

DC Output

Pin 1

DC Power Cable

AC Power

Connector

J1

Connector

J15

Ground Strap

(to cabinet

safety ground)

Chassis Safety

Ground Screw

Cooling Fan

(air inlet)

Voltage Select

Switch

Bottom-Mounting

Screws (4)

Voltage

Select

Plate

On / Standby Switch

Figure 8. Power supply installation

Side-Mounting

Screws (2 on

each side)

22

Installing an optional bezel

Use the following procedure to attach an optional bezel to the drive. The bezel
is available as an accessory (see section 4).

1. Remove the backing from the double-sticky tape attached to the rear surface
of the bezel.

2. Orient the drive and bezel as shown in Figure 9.

3. Align the mounting bosses on the rear of the bezel to the matching holes
in the drive chassis.

4. Press the bezel into place on the drive chassis ensuring that the mounting
bosses extend through the chassis holes and that the double-sticky tape
is in contact with both the bezel and chassis.

5. Remove the LED (if present) from the LED socket and insert the LED plug
from the bezel into the socket.

Installation 23

Control

Board

LED

Socket

LED
Plug

Chassis

Chassis Mounting Holes (2)

Active

LED

Bezel

Mounting

Boss

Figure 9. Attaching a bezel

24

Mounting the drive

The drive may be secured to the enclosure via tapped holes in either the sides
or the bottom of the drive chassis. Figure 10 shows two of the three allowable
orientations.

Note. The mounting screws must be completely engaged in the drive

chassis, but the portion that extends into the chassis must not exceed

3.2 mm (0.125 in) in length.

1. Place the drive into position in the enclosure and secure with four screws as
shown in Figure 10.

• For bottom mounting, use 6-32 screws.

• For side mounting, use either 6-32 screws or M4 X .70 (metric) screws.

There are tapped holes for each type.

2. Connect the 9-pin connector of the DC power cable to the output connector
on the power supply. Connect the 4-pin connector of the same cable to the
DC power connector J15 on the drive.

3. Connect the AC power cord to site power.

Installation 25

1

6-32

Bottom-Mounting

Screws (4)

DC power and pin

2

connector assignments

1234

Up

DC Power

Cable

NOTE:

Either side- or bottom-mounting screws

1

can be used with each drive orientation

Pin 1

2

DC Power
Connector

J15

Drive

Pin

1
2
3
4

M4 x .70

(metric)

Power

+12 VDC

+12 Volts return

+5 Volts return

+5 VDC

Up

M4 x .70

(metric)

1

6-32

Screw

Power Supply

(9 pin) Pin Number

6-32

Screw

Side-Mounting
Screws (2 on
each side)

7, 8
6, 9
3, 4
1, 2

Figure 10. Mounting the drive

26

Connecting the system I/O cabling

Be sure that the site has been prepared in accordance with the site requirements
information provided earlier in this section.

This procedure describes how to cable the system in a daisychain configuration.
This configuration was discussed earlier in this section under “Interface require­ments.”

The drive has one I/O connector (J06) on the control board. Figure 11 shows how
a typical I/O cable connects to the board.

If the drive is either the first or last device (at either end) in the daisychain, it must
be terminated. Drives in the middle of the daisychain must not be terminated.
Drives that are terminated have two terminator resistor-paks installed.

I/O

Connector

J06

Pin 1

Daisychain

I/O Cable

Figure 11. I/O cable attachment

Installation 27

Figure 12 shows how the terminator resistor-paks are attached on drives with
single-ended I/O. The terminator resistor-paks, which are single inline pack­ages, mount in the rows of holes located in the control board. Ensure that they
are installed with the correct orientation (indicated by a dot above pin 1) to
terminate these drives.

Terminator

Resistor-Pak

(note orientation)

Terminator

Resistor-Paks

(single inline

packages)

Pin

1

Mounting Holes

in Control Board

Terminator Power

Source Jumper

Figure 12. Terminator attachment—single-ended I/O

28

Figure 13 shows how the terminator resistor-paks are attached on drives with
differential I/O. These terminator resistor-paks, which are dual inline packages,
mount in sockets in the control board. These terminators are also marked with a
dot above pin 1.

If the drive is located at either end of the daisychain, ensure that it has
resistor-pak(s) installed. Section 4 lists resistor-pak part numbers. Refer to
information earlier in this section regarding the terminator power source
jumper.

Grounding the system

Grounding the system through the power cables and I/O cables is usually
sufficient to protect against noise and emissions.

Terminator

Resistor-Pak

(note orientation)

Terminator

Resistor-Paks

(dual inline

packages)

Terminator

Socket

Terminator Power

Source Jumper

Figure 13. Terminator attachment—differential I/O

Pin 1

Installation 29

Synchronizing the spindle

The spindle sync feature makes it possible to synchronize the spindle rotation
of a group of disc drives. This reduces the latency normally encountered when
the initiator switches between multiple disc drives.

Figure 14 shows two system configurations. In one type of system, one of the
disc drives in the system provides the reference clock. In the other type, an
external signal source provides the reference clock.

Spindle

Sync

Cable

32 loads

maximum

Terminator

Select

Plug

Internal Source

J05

T

SP

Drive

J05

Drive

(master)

J05

Drive

SP

J05

Drive

T

SP

External Source

Spindle

Signal Source

Sync

Cable

T

J05

Drive

✴

SP

J05

Drive

SP

32 loads

maximum

Terminator

J05

Drive

T

SP

Master designated by jumper or by initiator

✴

Figure 14. System diagram for spindle sync

30

To enable the feature, it is necessary to run an additional daisychain cable from
drive to drive and to make a master/slave selection for each drive. Connector J5
on the control board handles the cable connections. Master/slave selection is
made by a jumper on connector J4A. Figure 15 shows the two connectors.

For a drive at the end of the daisychain, the cable connects to one of the two rows
of pins (row A or row B), and a terminator connects to the other row of pins, as
shown in Figure 15. Both ends of the cable must be terminated.

Pin 4A

Cable from

Preceding Unit

Cable to

Next Unit

J4A

Pin 4B

J5

Pin 1B

Pin 1A

A

B

Control

Board

Select Plug

(removed = master)

Figure 15. Making spindle sync connections

Master / Slave

Installation 31

For each drive in the middle of the daisychain, the cable from the preceding unit
connects to one of the two rows of pins (row A or row B), and the cable to the
next unit connects to the other row of pins.

There are two ways to establish a drive as a master (supplying the sync
reference signal to all drives connected for spindle sync).

• Remove the jumper connecting the Master/Slave pins on connector J4A. The
drives are shipped with the pins disconnected.

• Issue that drive a Mode Select command on the SCSI interface. (The jumper
must be connecting the Master/Slave pins.) The spindle sync is controlled by
the RPL bits in page 4, byte 17 of the Mode Select (or Mode Sense)
parameters.

Only one drive in the daisychain can be established as the master. The master
drive can be located anywhere along the daisychain cable as long as both ends
of the cable are terminated.

32

Verification

After installing the drive, follow the sequence outlined below for initial startup.

1. Place the on/standby switch in the on ( l ) position. What follows depends
on the setting of the Start Command option and the Spinup Delay option
jumpers on the control board.

• If the Start Command option jumper was connected, the spindle spinup

begins immediately after a Start Unit command is received from the SCSI
bus.

• If the Spinup Delay option jumper and the Start Command option jumper

were both disconnected, the spindle spinup begins immediately.

• If the Spinup Delay option jumper was connected and the Start Command

option jumper was disconnected, the spindle spinup begins after a se­quence delay interval. The length of this interval equals the SCSI Bus ID
number (Target ID) multiplied by 10 seconds.

For example:

SCSI bus ID 0 = 0 second delay
SCSI bus ID 7 = 70 second delay

2. Observe that the Ready LED begins flashing when power is applied to the
spindle motor. The Ready LED is one of two green control board LEDs—see
Figure 16.

3. Observe that the Ready LED lights steadily within 30 seconds after the power
is applied to the spindle motor. This indicates that drive motor is up to speed
and that heads are at track 0.

4. Observe that the Heartbeat LED is blinking. This indicates that the SCSI
controller is operating properly. The Heartbeat LED is the other green
control board LED—see Figure 16.

If all of these events occurred, the drive is now ready for online operation. If
any event did not occur, a problem exists in the drive or its installation—refer
to section 5.

33

Section 3. Operation

This section provides the information and instructions to operate the drive. It
includes the following topics:

• Switches and indicators—locates and describes the switches and indicators
used for normal drive operation.

• Operating instructions—describes procedures for operating the drive.

Switches and indicators

Following initial checkout, the drive normally requires no attention from the
operator. Although power is usually left on, as the operator you should know
where the on/standby switch is located on the power supply. Also, you may be
asked to examine the maintenance LEDs.

Two of the maintenance LEDs are located on the drive’s control board. The
third maintenance LED is located either on the control board or on an optional
bezel (if the bezel is installed). Figure 16 shows these switches and indica­tors. They are explained in Table 7 following the figure.

34

Drive

Ready LED (green)

Control

Board

Socket for Active LED (red)

Heartbeat LED (green)

Active LED
(on optional
bezel)

Power

Supply

Note. Differential unit shown.

Figure 16: Switches and indicators

On / Standby Switch

Standby =

On = I

Operation 35

Table 7. Switches and indicators
Switch or Indicator Function

Power supply

On/standby switch Applies DC operating voltages to the drive electronics and
(on/ ) power supply fan when placed in the on ( l ) position.

Drive control board

Ready LED This LED flashes during the power on sequence until the
(green) discs are up to speed and the heads are loaded.

It is on steady with power on complete, assuming that

there are no fault conditions.

It flashes during a power off sequence. This occurs when
the drive receives a Start/Stop Unit command after it has
once been started.

Heartbeat LED This LED blinks when the SCSI controller is operating

(green) properly.

If the LED is constantly on or off, it indicates one of two
things:

• The SCSI controller is not functioning properly.

• The SCSI controller is executing diagnostics and
should be ready in a few seconds.

Active LED This LED socket is provided for units which do not use
(socket) the optional bezel. When the active LED is inserted into

this socket, it indicates SCSI command activity.
When it is on, the drive is executing a SCSI command.
When it is off, the drive does not have a SCSI command

to execute.

Optional bezel on drive

Active LED This LED indicates command activity by the drive.
(color unspecified)

When it is on, the drive is executing a SCSI command.
When it is off, the drive does not have a SCSI command

to execute.

36

Operating instructions

Following initial checkout, the drive normally requires no attention from the
operator. DC power is available to the drive, as the on/standby switch on the
power supply is normally left in the on ( l ) position.

If you wish to verify that the drive has completed its power on sequence, gain
access to the drive, and check that its Ready LED is on steady and that the
Heartbeat LED is blinking (see Figure 16).

If the Start Command option was selected (via a control board jumper), the
Stop/Start Unit command must be used to start and stop the drive.

If the Start Command option was not selected, once the drive has been
started, the Stop/Start Unit command can be used to stop and later restart the
drive.

37

Section 4. Parts data

This section lists part numbers of options and accessories that can be used in
a drive installation. Because the drive is depot repairable, there are no field­replaceable parts. If the drive requires maintenance, refer to the instructions in
section 5.

Within the continental U.S., you can order accessories from:

Seagate Technology, Inc.
Customer Services
7801 Computer Avenue South
Minneapolis, MN 55435

Phone: [phone](outside Minnesota)
Phone: [phone] (inside Minnesota)
Fax: [phone]

38

Table 8 below lists the part numbers for options and accessories for system
installation.

Table 8. Options and accessories
Part

Number Description

12263496 Static ground wrist strap, 6 1/2 to 8 inch wrist

** I/O cables

** External terminators
96752447 Terminator resistor-pak, single-ended
15479501 Terminator resistor-pak, differential
47188890 Power supply (with internal cooling fan)
75168323 AC power cord set, 100–120 V, 60 Hz, 5-15P
75168334 AC power cord set, 208–240 V, 60 Hz, 6-15P
75168324 AC power cord set, 208–240 V, 50 Hz
89500420 DC power cable, 24 inches (609.6 mm) long (power supply to drive)
89500422 DC power cable, 6 inches (15.2 cm) long (power supply to drive)
70553701 Bezel, black (with red LED, cable, and double-sticky tape)
70553702 Bezel, black (with green LED, cable, and double-sticky tape)
70703929 Spindle sync cable*, 1.5 foot (0.46 meter) long
70703921 Spindle sync cable*, 3 foot (0.92 meter) long
70703922 Spindle sync cable*, 5 foot (1.52 meter) long
70703923 Spindle sync cable*, 7 foot (2.12 meter) long
70703924 Spindle sync cable*, 10 foot (3.05 meter) long
70703925 Spindle sync cable*, 20 foot (6.10 meter) long
70703926 Spindle sync cable*, 30 foot (9.14 meter) long
70703927 Spindle sync cable*, 40 foot (12.20 meter) long
70703928 Spindle sync cable*, 50 foot (15.24 meter) long
70574221 Spindle sync terminator
97630051 Shunt, two-pin (2 mm) (Used to select options on circuit board

jumpers J4A and J4B)

* A custom cable may be needed for spindle sync connection between a drive and

an external source.

** See the reference manual (publication 83327640) for part numbers of terminators,

complete I/O cables, and connectors and cabling needed to create custom I/O
cables.

39

Section 5. Maintenance

This section contains the following maintenance information:

• Observing maintenance precautions

• Arranging for depot repair

• Removing and replacing a drive

• Removing and replacing a power supply

• Packing a drive for shipment

Observing maintenance precautions

Because the drive is depot repairable, there are no field-replaceable parts.

Before beginning any maintenance activities, observe the following precau-

tions:

• Follow the precautions listed under “Electrostatic discharge protection” in the
preface.

• Do not remove any circuit boards from the drive chassis. Return the entire
drive for depot repair if any circuit board is defective. Removal of circuit boards
by personnel not performing depot repair will damage components and may
void the warranty.

• Do not remove the head and disc assembly (HDA) from the drive chassis.
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.

• Use forced-air ventilation when bench-testing the drive to ensure proper
cooling of drive components.

• Do not handle the drive while powered up, due to the gyroscopic motion
produced by discs that have not completed spinning down.

• Do not connect or disconnect the I/O cable while power is applied to the drive
or other SCSI devices. If the SCSI bus is active, this will cause errors.

• Do not connect or disconnect the DC power cable while the power supply is
energized.

40

Arranging for depot repair

Before returning any units to Seagate, it is necessary to obtain a returned
material authorization (RMA) number. To get the number, you will need to know
the part number and serial number of the unit. These numbers appear on a label
located on the front surface of the HDA. Then contact:

Seagate Technology, Inc.
Customer Services
7801 Computer Avenue South
Minneapolis, MN 55435

Phone: [phone](outside Minnesota)
Phone: [phone] (inside Minnesota)
Fax: [phone]

Removing and replacing a drive

Caution. When servicing the drive, observe all precautions listed under “Elec-

trostatic discharge protection” in the preface. Failure to observe these
precautions can result in serious damage to electronic assemblies.

Warning. Be sure that the drive has completed spinning down before removing

it from its mounting. You may be physically harmed by the gyroscopic
motion produced by discs that have not completed spinning down.

To remove a drive for maintenance, perform the following steps:

1. Remove power from the drive by setting the On/Standby switch on the power
supply to the Standby position.

2. Disconnect the AC power cable from site power.

3. Disconnect the I/O cable and spindle sync cables (if used) from the drive.

4. Disconnect the DC power cable from the DC power connector on the drive.

5. Remove the mounting screws that secure the drive chassis to the cabinet.

6. Carefully lift the drive from its mounting, and move it to the desired location.

To install a replacement drive, follow the procedures in section 2.

Maintenance 41

Removing and replacing a power supply

To remove a power supply for maintenance, perform the following steps:

1. Remove power from the drive by setting the On/Standby switch on the power
supply to the Standby position.

2. Disconnect the AC power cable from site power.

3. Disconnect the DC power cable from the DC power connector on the power
supply.

4. Remove the chassis safety ground screw from the power supply to
disconnect the ground strap.

5. Remove the mounting screws that secure the power supply to the cabinet.

6. Carefully lift the power supply from its mounting, and move it to the desired
location.

To install a replacement power supply, follow the procedures in section 2.

Packing a drive for shipment

If it is necessary to ship the drive, repack the drive with the original packing
materials (saved during installation). Comply with the packing instructions to
ensure that the drive will be undamaged in shipment. To obtain packing
instructions or a new shipping container, contact:

Seagate Technology, Inc.
Customer Services
7801 Computer Avenue South
Minneapolis, MN 55435

Phone: [phone](outside Minnesota)
Phone: [phone] (inside Minnesota)
Fax: [phone]

When ordering packing instructions or a new shipping container, specify the
exact equipment number and series code of the drive as shown on the
equipment identification label.

42

Maintenance 43

44

Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA

Publication Number: 83327630, Rev. A