Seagate ST125N Manuel utilisateur

ST125N

ST138N

ST157N

PRODUCT

MANUAL

_______

&)>

Seagate

ST125N/ST138N/ST157N

Product Manual

March

1988

36045-001, Rev. C

&)>Seagate

920 Disc Drive, Scotts Valley,

95066-4544, USA

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

(c)

1988

Seagate Technology

Inc.

This manual

and

all

the

material contained

are

copyrighted with all

rights reserved. This

manual

may not

copied,

whole or

part,

without written consent of Seagate Technology.

Seagate reserves the right to

change,

without notice, the specifications

contained in this

manual.

ST125N/138N/157N Product

Manual,

Rev.

Table of Contents

1Specification Summary . . • • • . • • • . • • . • . • • • • • • •1

1.1

Drive Capacity . . . . . . . . . . . . . . . . . • . . . . . . . 1

1.1.1

Fonnatted Capacity . . . . . . . . . . . . . . . . . . . .1

1.2 Data Organization . . . . . . . . . . . . . . . . . . . . . . .1

1.3 Access Time Definition

and

Timing . . . . . . . . . . . . . .2

1.4 Functional

SpecHlcatlons

. . . . . . . . . . . . . . . . . . . .3

1.5 Physical

SpecHlcatlons

. . . . . . . . . . . . . . . . . . . . .4

1.6 Rellablllty Specifications . . . . . . . . . . . . . . . . . . . .4

7 Environmental

SpecHlcatlons

. . . . . . . . . . . . . . . . .4

7.1

Ambient Temperature . . . . . . . . . . . . . . . . . . .4

7.2 Temperature Gradient . . . . . . . . . . . . . . . . . . .4

Relative Humidity . . . . . . . . . . . . . . . . . . . . .4

Altitude . . . . . . . . . . . . . . . . . . . • . . . . . .5

1.8 Shock and Vibration Specifications . . . . . . . . . . . . . .5

1.8.1

Operating Shock . . . . . . . . . . . . . . . . . . . . .5

1.8.2Operating Vibration . . . . . . . . . . . . . . . . . . . .5

1.8.3 Nonoperating Shock . . . . . . . . . . . . . . . . . . .5

1.8.4 Nonoperatlng Vibration . . . . . . . . . . . . . . . . . .6

1.9

Power Specifications

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

1.9.1

Input Noise Ripple

and

Frequency . . . . . . . . . . . .7

1OMounting Requirements . . . . . . . . . . . . . . . . . . .8

1.1O.1

ShockMounting Recommendations . . . . . . . . . . .8

1.10.2 Handling and Static Discharge Precautions

......

1/0 Cable Requirements . . . . . . . . . . . . . . . . . . 1O

1.11.1

Cable

.........................•

1.11.2Connector Requirements . . . . . . . . . . . . . . .

1.12

SCSI

Bus

Drivers/Receivers . . . . . . . . . . • . . . . .

2 General Product Definition

••.••••••••••••••••

2.1

SCSI

Interface . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Intelligent Disc Drive Configuration . . . . . . . . . . . . .

2.2.1

SCSI

Bus

Address . . . . . . . . . . . . . . . . . . .

2.3 ST125N/138N/157N

SCSI

Commands . . . . . . . . . . .

2.4 Error Recovery . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Disc Format . . . . . . . . . . . . . . . . . . . . . . . . .

2.5.1

Formatting

and

Defect Management . . . . . . . . . .

2.5.2 Sector Interleave . . . . . . . . . . . . . . . . . . . .

2.6 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Incoming Inspection . . . . . . . . . . . . . . . . . . . . .

ST125N/138N/157N Product Manual,

Rev.

Ill

2.7.1 Enabling the Offline Selftest Routines

.........

·.19

iv ST125N/138N/157N Product Manual, Rev. C

1 Specification Summary

1.1 Drive Capacity

1.1.1 Formatted Capacity

ST125N

Guaranteed Megabytes: 21.3 21.5 18.2

Bytes per Cylinder: 52,224 52,736 44,800

Bytes perTrack: 13,312 13,312 11,264

Bytes perSector: 1,024 512 256

ST138N

Guaranteed Megabytes: 31.8 32.2 27.4

Bytes per Cylinder: 52,224 52,736 44,800

Bytes perTrack: 13,312 13,312 11,264

Bytes perSector: 1,024 512 256

ST157N

Guaranteed Megabytes: 48.2 48.6 41.3

Bytes per Cylinder: 78,848 79,360 67,328

Bytes perTrack: 13,312 13,312 11,264

Bytes per Sector: 1,024 512 256

1.2 Data Organization

ST125N

Guaranteed Sectors: 20,757 . 41,921 71,225

Sectors per Cylinder:

103 175

Sectors perTrack: 13 26 44

Diagnostic

R/W

Cylinders: 1 1 1

Bytes perSector: 1,024 512 256

ST125N/138N/157NProduct Manual, Rev. C 1

ST138N

Guaranteed

Sectors:

31,059

62,933

107,100

Sectors

per

Cylinder:

103

175

Sectors

per

Track:

26 44

Diagnostic

R/W

Cylinders:

1 1 1

Bytes

per

Sector:

1,024

512

256

ST157N

Guaranteed

Sectors:

47,047

94,860

161,219

Sectors

per

Cylinder:

155

263

Sectors per

Track:

26 44

Diagnostic

R/W

Cylinders:

1 1 1

Bytes

per

Sector:

1,024

512

256

1.3 Access Time Definition and Timing

Access

time

atrue statistical

average

least

5000

measurements

the time It

takes

execute

the

seek

speclfted

below

less

overhead.

Overhead

measured

Issuing

motion

seek

from

the

highest

Logical

Block

Address

(LBA).

Seek

times

are

measured

monitoring

the

Busy

line

the

SCSI

bus.

All

measurements

assume

a block

size

512

bytes

and

ambient

temperature

25°

Track-to-track

access

time

average

all

possible

single track

seekS

both

directions.

Average

access

time

measured

executing

seek

commands

from

one

random

LBA

another.

Maximum

(fUll-stroke)

access

time

halfthe time

needed

seek

from

LBA

otothe

maximum

LBA

and back to

LBA

ST125N/138N/157N

Product

Manual,

Rev.

MLC-0

MLC-1

Track-to-Track:

Average:

Maximum

(Full-Stroke):

Average

Latency:

msec.

typ.

msec.

max.

msec.

typ.

msec.

max.

msec.

typ.

msec.

max.

8.33msec.

8msec.

typ.

msec.

max.

msec.

typ.

msec.

max.

msec.

typ.

msec.

max.

8.33msec.

Note: Several factors contribute to overhead time, Including host

and controller

overhead.

Host overhead varies from

one

host

to another

and

can

not

specified. Controlleroverhead

function ofcontroller hardware

and

firmware

and

typically

less than 3

msec.

1.4 Functional Specifications

ST125N ST138N ST157N

Tracks:

Cylinders:

Read/Write

Heads:

1,628

407

(0-406)

2,452

615

(0-614)

3,678

615

(0-614)

Discs:

Rotational

Speed:

Recording

Method:

Recording Density

(BPI):

Flux

Density

(FCI):

Track Density

(TPI):

Interface:

1/0 DataTransfer

Rate:

Int.

DataTransfer

Rate:

Nonrecoverable

Read

Errors:

2 2

3,600±0.5%

RLL

(2,7)

22,430

14,953

824

SCSI

to 1.5

Mbytes/sec.

7.5

Mblts/sec.

1per 1012 bits

read

ST125N/138N/157N Product

Manual,

Rev.

1.5 Physical Specifications

Height:

Width:

Depth:

Weight:

1.63inches max. (41.4 mm)

4.02 inches max. (102.6 mm)

5.77 inches max. (146.6 mm)

1.6lbs. (0.73 Kg.)

1.6 Reliability Specifications

MTBF:

PM:

MTTR:

ComponentDesign Life:

30,000 Power-on hours (Typical usage

at 25°C ambienttemp., sea level)

Not Required

30minutes

5years

7 Environmental Specifications

1.7.1

Ambient Temperature

Operating:

Nonoperating: 10°C to

45°

C (50° F to 113°

-40° C to

60°

C (-40° F to 140°

1.7.2 Temperature Gradient

Operating:

Nonoperating:

10°

C/hr max. (18° F/hr)

Belowcondensation

1.7.3 Relative Humidity

Operating:

Maximum Wet Bulb:

Nonoperating:

8 to

80%

noncondensing

26° C (78.8°

noncondensing

Belowcondensation

ST125N/138N/157N Product Manual, Rev. C

7.4 Altitude

Operating:

-1,000ftto

10,000ft

Nonoperating: -1,000 ft to 30,000 ft

1.8 Shockand Vibration Specifications

All shockand vibration measurements assumethatthedriveis mounted

in an approved orientation with the Input levels at the drive mounting

screws.

Shock measurements are based on an

msec. half-sine wave shock

pulse.Thenonoperatlngspecificationsassumethattheread/writeheads

are positioned in the shipping zone atthe inside diameter ofthe disc.

1.8.1

Operating Shock

Maximum permitted shock without incurring physical damage

degradation in performance: 1OG's

1.8.2 Operating Vibration

Maximumpermitted vibration atthefollowing frequencies, without incur-

ring physical damage ordegradation in performance:

Frequency

5-22 Hz

22-300Hz

300-22Hz

22-5 Hz

1.8.3 Nonoperating Shock

Vibration

0.020 in. double amplitude

0.5 G peak amplitude

0.020 in. double amplitude

Maximum permitted shock without incurring physical damage

degradation in performance: 60 G's

ST125N/138N/157N Product Manual, Rev. C 5

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