Seagate ST251N Manual de usuario

ST251N

ST277N

PRODUCT

MANUAL

&5>

Seagate

ST251N/ST277N

Product Manual

March

1987

36034-001, Revision B

920 Disc Drive, Scotts Valley, CA 95066-4544, USA

Telephone: 408/438-6550 e Telex: 176455 SEAGATE SCVL

659

Seagate

Notice

This manual and all the

material

contained in

are copyrighted with

may

not be copied, in

whole

part,

without

written

consent of Seagate Technology.

Seagatereservesthe

right

tochange, without notice, the specifications

contained in this manual.

IBM PC/XT/AT are registered

trademarks

of International Business

Machines Corporation.

ii ST251N/277N

Product

Manual,

Rev. B

CONTENTS

1.0 INTELLIGENT DISC DRIVE SPECIFICATION SUMMARY .

1-1

1.1

Drive

Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.1.1 Formatted Capacity . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.1.2Data0rganization

.........................

1-1

1.2

Performance

Specifications

. . . . . . . . . . . . . . . . . . . . . . . 1-2

1.3 Access

Time

Definition and

Timing

. . . . . . . . . . . . . . . . . 1-2

1.4 Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1.5 Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.6

Reliability

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.7

Environmental

Specifications

. . . . . . . . . . . . . . . . . . . . . 1-3

1.7.1

Ambient

Temperature

. . . . . . . . . . . . . . . . . . . . . . 1-3

1.7.2

Temperature

Gradient

. . . . . . . . . . . . . . . . . . . . . . 1-3

1.7.3 Relative

Humidity..........................

1-3

7.4

Altitude

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

1.8 Shock and

Vibration

Specifications

. . . . . . . . . . . . . . . . . 1-4

1.8.1 Operating Shock . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

1.8.2 Operating

Vibration

. . . . . . . . . . . . . . . . . . . . . . . . 1-4

1.8.3 Nonoperating Shock . . . . . . . . . . . . . . . . . . . . . . . . 1-4

1.8.4 Nonoperating

Vibration

. . . . . . . . . . . . . . . . . . . . . 1-5

1.9

Power

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

1.9.1 Input Noise

Ripple

and Frequency . . . . . . . . . . . . 1-6

1.10 Mounting

Requirements.........................

1-7

1.10.1 Shock

Mounting

Recommendations

. . . . . . . . . . 1-9

1.10.2 Handling and Static Discharge Precautions . . . . 1-9

1.111/0

Cable

Requirements

. . . . . . . . . . . . . . . . . . . . . . . .

1-11

1.11.1 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-11

1.11.2 Connector

Requirements

. . . . . . . . . . . . . . . . . . .

1-11

1.12 SCSI Bus

Drivers/Receivers

. . . . . . . . . . . . . . . . . . . . . 1-13

2.0 GENERAL PRODUCT DEFINITION . . . . . . . . . . . . . . . . . .

2-1

2.1

SCSI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2.2

Intelligent

Disc

Drive

Configuration

. . . . . . . . . . . . . . . . . 2-2

2.2.1 SCSI Bus

Address

. . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.3 ST251N/277N SCSI

Commands

. . . . . . . . . . . . . . . . . . . . 2-2

2.4

Error

Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

ST251N/277N

Product

Manual,

Rev. B

iii

2.5 Disc Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

2.5.1 Formatting and Defect Management . . . . . . . . . . . 2-4

2.5.2 Record Interleave . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

2.6 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

2.7 Incoming Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2.7.1

Enabling the Offline Selftest Routines . . . . . . . . . . 2-6

iv ST251N/277N

Product

Manual,

Rev. B

LIST OF ILLUSTRATIONS

Figure

Typical RMS Start-up

Current

Profile . . . . . . . . . . . 1-6

Figure

Mounting

Dimensions.

. . . . . . . . . . . . . . . . . . . . . . 1-8

Figure

Host/Drive Interface

Connectors

. . . . . . . . . . . . . . 1-10

Figure

Nonshielded Cable

Connector

......

, . . . . . . . . . 1-12

Figure

50-Pin SCSI

Connector

Assignments

. . . . . . . . 1-12

Figure

Command

Summary

. . . . . . . . . . . . . . . . . . . . . . . . 2-3

ST251

Nl277N Product Manual, Rev. B v

vi ST251N/277N Product Manual, Rev. B

INTRODUCTION

This

manual supports the

ST251

N and ST277N

disc

drives.

These

drives

are

complete

hard

disc

subsystems

for

desktop comput-

ers and othersystems

requiring

a rugged, half-heightstorage solution.

Seagate

intelligent

disc

drives

have an embedded

controller

which

supports the

small

computer

system interface (SCSI

command

set),

as defined by ANSI X3T9.2/82-2,

for

self-configuring software.

Seagate

reliability

is a built-in feature. Our manufacturing

facilities

are designed and located

exclusively

for

the high-volume production

and testing of

disc

drives.

Our

commitment

to vertical integration en-

compasses

read/write

head assembly,

board,

media

and

stepper

motor

manufacturing.

This

assures you of the latest technology, con-

sistent quality and the

lowest

possible cost.

For pricing and

delivery

information call:

Inside

California

1-800-468-DISK

Outside

California

1-800-468-DISC

ST251

Nl277N Product Manual, Rev. B vii

viii

ST251Nl277N

Product

Manual, Rev. B

1.0 INTELLIGENT DISC DRIVE

SPECIFICATION SUMMARY

1.1

DRIVE CAPACITY

1.1.1 FORMATTED CAPACITY

ST251N

Guaranteed Megabytes: 42.7

Bytes per Cylinder: 52,224

Bytes

per

Track: 13,312

Bytes per Sector: 1,024

1.1.2 DATA ORGANIZATION

Guaranteed Sectors:

Sectors per Cylinder:

Sectors per Track:

41,718

ST251N!277N

Product

Manual,

Rev. B

43.1

52,736

13,312

512

84,254

103

ST277N

64.4 64.9

78,848 79,360

13,312 13,312

1,024 512

63,804 126,790

155

1-1

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