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

Este manual sirve para los siguientes modelos

Tabla de contenidos

Otros manuales de Almacenamiento de Seagate

Seagate

Seagate Enterprise Capacity 3.5 HDD/Constellation ES Manual de usuario

Seagate

Seagate Scorpion 240 DDS-4 Manual de usuario

Seagate

Seagate Video 2.5 Manual de usuario

Seagate

Seagate ST3120025ACE Manual de usuario

Seagate

Seagate ST902503FGA2E1-RK Manual de usuario

Seagate

Seagate ST373453LC - Cheetah 73.4 GB Hard Drive Manual de usuario

Seagate

Seagate CONSTELLATION ES ST32000444SS Manual de usuario

Seagate

Seagate DiskStor Manual de usuario

Seagate

Seagate ST31000524AS Manual de usuario

Seagate

Seagate ST336754SS - Cheetah 36.7 GB Hard Drive Manual de usuario

Seagate

Seagate MOMENTUS 7200.3 SATA ST9120411AS Manual de usuario

Seagate

Seagate BARRACUDA ST5000LM000 Manual de usuario

Seagate

Seagate 15K.4 - Cheetah - Hard Drive Manual de usuario

Seagate

Seagate SAVVIO ST9300405SS Manual de usuario

Seagate

Seagate FreeAgent Go Manual de usuario

Seagate

Seagate Cheetah ST3146807LW Manual de usuario

Seagate

Seagate ST19171W - Barracuda 9.1 GB Hard Drive Manual de usuario

Seagate

Seagate ST3000VX006 Manual de usuario

Seagate

Seagate Medalist Pro Series Manual de usuario

Seagate

Seagate NL35.2 ST3250624NS Manual de usuario

Seagate

Seagate ST9300 Series Manual de usuario

Seagate

Seagate ST15150N - Barracuda 4.3 GB Hard Drive Manual de usuario

Seagate

Seagate ST373453LC - Cheetah 73.4 GB Hard Drive Manual de usuario

Seagate

Seagate ST34555N Manual de usuario

Manuales populares de Almacenamiento de otras marcas

QNAP

QNAP TS 32PXU Series Manual de usuario

LaCie

LaCie RUGGED RAID Manual de usuario

Freecom

Freecom CLS DOCK Manual de usuario

PNY

PNY Attache P-FD64MBATT3 Manual de usuario

HP StorageWorks MSL2024 Manual de usuario

OLT

OLT 6x6 Maximizer Manual de usuario

Transcend

Transcend JetFlash 160 Manual de usuario

LaCie

LaCie RUGGED MINI Manual de usuario

Thunderbolt

Thunderbolt 600 Manual de usuario

Panasonic

Panasonic LB-DH8 series Manual

Intel

Intel RAID High Availability Manual de usuario

LaCie

LaCie 12big Thunderbolt 3 Manual de usuario

Spectra Logic

Spectra Logic T-Series Spectra T50e Manual de usuario

Panasonic

Panasonic LKM-F931-1 Manual de usuario

Tabernus

Tabernus Enterprise Erase E2400 Manual de usuario

Rocstor

Rocstor COMMANDER 3F series Manual de usuario

HP P9000 Manual de usuario

Western Digital

Western Digital Ultrastar Data60 Manual de usuario