Seagate ST251R Manual de usuario

ST251/ST251

RIST277R

Product

Manual

February 3, 1987

36035-001,

Revision A

920

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

Telephone:

408/438-6550.

Telex: 176455 SEAGATE SCVL

c5S»

seagate

This manual and all the material contained in

are copyrighted with

part, without written consent of Seagate Technology.

Seagate reservesthe rightto change, without notice, thespecifications

contained

this manual.

ST251

1251

RI277R

Product Manual, Rev.A

CONTENTS

1.0 SPECIFICATION SUMMARY

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

1-1

1.1

Drive

Capacity.

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

1-1

1.1.1

Unformatted Capacity

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

1-1

1.1.2 Formatted Capacity . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.1.3 Physical

Organization.

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

1-1

1.2

Access Time Definition and

Timing.

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

1-2

1.3

Step Pulse Period and Seek

Method.

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

1-2

1.4 Functional

Specifications.

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

1-3

1.S

Recording

Methods.

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

1.6

Physical Specifications

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

1-3

1.7

Reliability

Specifications.

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

1.7.1

Read

Error

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

1.7.1.1 Bit

Jitter.

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

1.7.2 Media

Defects.

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

1-4

1.7.2.1

ST2S1

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

1-S

1.7.2.2

ST2S1R

.......

, . . . . . . . . . . . . . . . . . . . . .

1-S

1.7.2.3 ST277R .

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

1-S

1.8

Environmental Specifications

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

1-S

1.8.1

Ambient Temperature

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

1-S

1.8.1.1

ST251

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

1-S

1.8.1.2 ST251R/277R

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

1-5

1.8.2 Temperature Gradient . . . . . . . . . . . . . . . . . . . . . . 1-5

1.8.3 Relative

Humidity.

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

1-6

1.8.4 Altitude

Limits.

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

1-6

1.8.S

Shock and Vibration

Specifications.

. . . . . . . . . . .

1-6

1.8.S.10peratingShock

...........

..........

1-6

1.8.S.2 Operating

Vibration.

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

1.8.5.3 Nonoperating Shock

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

1-7

1.8.5.4 Nonoperating Vibration . . . . . . . . . . . . . . . .

1-7

1.9

Power

Specifications.

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

1-8

1.9.1

Input Noise Ripple and Frequency

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

1-10

1.9.2 ULlCSA

Certification.

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

1.10

FCC

Certification

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

1-10

1.11

Mounting

Requirements.

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

1-11

1.11.1

Shock Mounti

Recommendations

..........

1-11

ST251

/251

RI277R Product Manual, Rev.A

iii

1.11.2 Handling

Precautions.

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

1.11.3 Shipping

Zone............

.....

.........

. 1-13

1.12

Auto-Truncation.

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

1.13 Typical Drive Timing

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

1-14

2.0 DRIVE

CONFIGURATION.

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

2-1

2.1

Drive Configuration Shunt

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

2-1

2.2 Drive

Select

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

2.2.1

Daisy-Chain/Radial Drive Configurations

.....

. . 2-2

2.3 Write

Fault

Latch Options:

JP1

and J7 . . . . . . . . . . . . . . . 2-2

2.4 DC-Unsafe Option: JP2

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

2-3

2.5 Precompensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.6 Life-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

APPENDIX

MFM/RLL FORMAT

EXAMPLE.

. . . . . . . . . . .

A-1

iv ST251

1251

RI277R

Product

Manual, Rev.A

LIST OF ILLUSTRATIONS

Figure

Typical +

VDC

Start-Up Current Profile

......

1-9

Figure

Typical Power-On Sequence

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

1-9

Figure

Drive Mounting

Dimensions.

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

Figure

Read/Write

Timing.

. . . . . . . . . . . . . . . . . . . . . . . . 1-14

Figure

Buffered-Seek

Timing.

. . . . . . . . . . . . . . . . . . . . . . 1-15

Figure

Auto-Truncation

Timing.

. . . . . . . . . . . . . . . . . . . . 1-15

Figure

Host/Drive Interface Connectors

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

2-1

ST251

/251RI277R Product Manual, Rev.A v

ST251

1251

RI277R

Product

Manual,

Rev.A

INTRODUCTION

This manual supports the

ST251

1251

R/277R discdrives. It supercedes

and replaces the

ST251

Product Manual, 36016-001, Rev.

ST251

1251

RI277R

Product

Manual,

Rev.A

vii

viii

ST251

/251R/277R Product Manual, Rev.A

1.0 SPECIFICATION SUMMARY

1.1 DRIVE CAPACITY

1.1.1 UNFORMATTED CAPACITY

ST251 ST251R ST277R

Megabytes Per Drive: 51.2 51.2 76.9

Bytes Per Cylinder: 62,496 62,496 93,744

Bytes Per Track: 10,416 15,624 15,624

1.1.2 FORMATTED CAPACITY

Megabytes Per Drive: 42.8 43.6 65.5

Bytes Per Cylinder: 52,224 53,248 79,872

Bytes Per Track: 8,704 13,312 13,312

Bytes Per Sector: 512 512 512

Sectors

per

Track: 17 26

1.1.3 PHYSICAL ORGANIZATION

Tracks: 4,920 3,280 4,920

Cylinders: 820 (0-819) 820 (0-819) 820 (0-819)

Read/Write Heads: 6 4 6

Discs: 3 2 3

ST251

/251R/277R Product

Manual,

Rev.A

1-1

1.2 ACCESS TIME DEFINITION AND TIMING

Access

time

is defined as the

time

from the leading edge

the first

step pulse received to Seek Complete (including settling). All seek

times are

true

statistical averagesand are calculated with a step pulse

period of 10 psec.

nominal power and temperature.

Track-to-Track:

Average:

Full-Stroke:

Average Latency:

8 msec. max.

msec. max.

8.33

msec.

1.3 STEP PULSE PERIOD AND SEEK METHOD

The step signal is a 2psec. minimum width pulse which initiates read/

write head motion. The step pulse period determines the access

method. The number of pulses determines the seek length. The step

pulse period must

between

3/lsec.

and 200/lsec.

Steppulses may

lostatperiodsgreaterthan 200jJsec. Foradditional

information

step pulses and seek methods consult the Seagate

ST412

Interface

Manual.

1-2

ST251

1251

RI277R

Product

Manual, Rev.A

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