Seagate ST43400N/ND Manual de usuario

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Elite Disc Drive

ST43400N/ND

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User’s Manual

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

Publication Number: 83327630, Rev. A

Seagate®, Seagate Technology®, and the Seagate logo are registered

trademarksofSeagateTechnology,Inc.EliteTM,SeaFAXTM,SeaFONETM,and

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.

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 instal-

lation, 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

somedevicessuch as metal-oxide semiconductors are extremelysensitive,

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

dischargeofachargedconductororbyexposuretothestaticfieldssurround-

ing charged objects. To avoid damaging drive electronic assemblies, ob-

serve 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

metalassembly.Asageneralrule,rememberthatyouandthedriveelectron-

ics 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.

Important safety information and precautions

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

proper cooling of drive components.

Usepropersafety and repair techniques for safe,reliableoperation of this unit.

Service should be done only by qualified persons. We recommend the proce-

dures 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

endangeryouorothers.Thecautionspointoutconditionsorpracticesthatmay

damage the unit, possibly making it unsafe for use.

Youmustalsounderstandthatthesewarningsandcautionsarenotexhaustive.

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-approvedprocedureortool,firstensurethatthemethodyouchoosewillnot

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.

• Usecautionwhentroubleshootingaunitthathasvoltagespresent.Turnoff

power to the unit before servicing it.

• Wear safety shoes when removing or replacing heavy parts.

• Provideameanstoisolatethedrivefromthemainpowerincaseoffireorother

emergency.

• Ensure that the internal temperature of the rack or cabinet does not exceed

thelimitsdefinedforthedrive,whenthedriveismountedinanequipmentrack

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

drivefordepotrepairifanycircuitboardisdefective.Removalofcircuitboards

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.

• Donotattempttodisassemblethe HDA.Itisnot fieldrepairable.Ifthe 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

accordancewithUL1950,IEC950,EN60950,CSAC22.2950,andVDE0806.

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.

Seagatetakesall reasonable steps to ensure thatitsproducts are certifiable to

currently accepted standards. Typical applications of these disc drives include

customerpacking and subsystem design. Safetyagenciesconditionally 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 compli-

ance 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.

ThisunitisacomponentassemblyandassuchisnotmeanttocomplywithFCC

orsimilarnationalrequirementsasastand-aloneunit.Engineeringradiatedand

conducted emissions test results are available through the Seagate Safety

Department to assist the subsystem designer.

Technical support services

Seagate Technology provides technical support literature and diagnostic utili-

ties 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: (408) 438-2620

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: (408) 438-8222

The enhanced phone system provides recorded technical information on

selectedSeagateproductswhileyouareonhold.Technicalsupportspecialists

are available to answer questions from 8:00 A.M. to 5:00 P.M. PST, Monday

throughFriday.Recordingsareaccessibletwenty-fourhoursaday,sevendays

a week.

SeaBOARD:

The Seagate Technical Support Bulletin Board System (BBS) is available

twenty-fourhoursaday,sevendaysaweek.Amodemisrequiredtoaccessthis

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 (408) 438-8771 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.Thisisatollcallifyoudialfromoutsideofthenumber’slocaldialingarea.

Section 1. General description

TheSeagateST43400N/NDElite3disc drives are high speed, random access

digitaldatastoragedevices.TheycommunicatewithaninitiatorusingtheSmall

Computer System Interface (SCSI). The drive is shown in Figure 1, and its

specifications are listed in Table 1 on the following page.

Thedriveisacomponentfor installation in an enclosure designed for thedrive.

The enclosure design must ensure adequate cooling for the drive, and it must

address the requirements for grounding and for shielding of emissions. The

referencemanual(publication83327640)presentsguidelinesfordesigningthe

enclosure, but the design is your responsibility.

Figure 1. The ST43400N/ND disc drive

Control

Board Power

Board

Optional

Bezel

Chassis

DC Power

Connector

Spindle Sync

Connector

Option

Jumpers

I/O

Connector

Option

Jumpers

Option

Jumpers

Head and Disc

Assembly (HDA)

Pin 1

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.

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

anexternalpower supply, which receives its ACinputpower 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

requiredfordriveoperation.TheHDAisasealedunitcontainingtheelectrome-

chanical 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

mountedonaspindle,andthespindleiscoupleddirectlytothedrivemotor.The

drivemotor 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.

Alldriveoperationsarerelatedto data recovery and storage (normally referred

toasreadingandwriting).Theactualreadingandwritingisperformedbyheads

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)andtousetheheadlocatedoverthesurface(headselection)where

the operation is to be performed.

Theheadsaremountedontheactuator,andtheactuatormovestheheadsover

the rotating discs. There are 22 heads; a servo head to sense actuator

positioningand21dataheadsusedfordatatransferstoandfromthediscs.The

actuator has a voice coil that moves in a permanent magnetic field in response

to signals from the servo positioning circuitry.Thevoice 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

preassignedlandingzonelocatedbeyondthedatazone.Theactuatorautomati-

cally 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.

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