Seagate ST125N,ST138N,ST157N Product Manual
ST125N
ST138N
ST157N
PRODUCT
MANUAL
_______
&)>
Seagate
ST125N/ST138N/ST157N
Product Manual
March
2,
1988
36045-001, Rev. C
&)>Seagate
920 Disc Drive, Scotts Valley,
CA
95066-4544, USA
Telephone: 408/438-6550 Telex: 176455 SEAGATE SCVL
Copyright Notice
(c)
Copyright
1988
Seagate Technology
Inc.
This manual
and
all
the
material contained
In
It
are
copyrighted with all
rights
reserved. This
manual
may not
be
copied,
In
whole or
In
part,
without written consent of Seagate Technology.
Seagate
reserves the right to
change,
without notice, the specifications
contained in this
manual.
II
ST125N/138N/157N Product
Manual,
Rev.
C
Table of Contents
1 Specification 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
1.
7 Environmental
SpecHlcatlons
. . . . . . . . . . . . . . . . . 4
1.
7.1
Ambient Temperature . . . . . . . . . . . . . . . . . . . 4
1.
7.2 Temperature Gradient . . . . . . . . . . . . . . . . . . . 4
1. 7 .3
Relative Humidity . . . . . . . . . . . . . . . . . . . . . 4
1. 7 .4
Altitude . . . . . . . . . . . . . . . . . . . • . . . . . . 5
1.8
Shock and Vibration Specifications . . . . . . . . . . . . . . 5
1.8.1
Operating Shock . . . . . . . . . . . . . . . . . . . . . 5
1.8.2
Operating Vibration . . . . . . . . . . . . . . . . . . . . 5
1.8.3 Nonoperating Shock . . . . . . . . . . . . . . . . . . . 5
1.8.4 Nonoperatlng Vibration . . . . . . . . . . . . . . . . . . 6
1.9
DC
Power Specifications
....................
6
1.9.1
Input Noise Ripple
and
Frequency . . . . . . . . . . . . 7
1.
1 O Mounting Requirements . . . . . . . . . . . . . . . . . . . 8
1.1O.1
Shock Mounting Recommendations . . . . . . . . . . . 8
1.10.2
Handling and Static Discharge Precautions
......
10
1.
11
1/0 Cable Requirements . . . . . . . . . . . . . . . . . . 1 O
1.11.1
Cable
.........................•
10
1.11.2 Connector Requirements . . . . . . . . . . . . . . .
11
1.12
SCSI
Bus
Drivers/Receivers . . . . . . . . . . • . . . . .
12
2 General Product Definition
••.••••••••••••••••
13
2.1
SCSI
Interface . . . . . . . . . . . . . . . . . . . . . . . .
13
2.2 Intelligent Disc Drive Configuration . . . . . . . . . . . . .
13
2.2.1
SCSI
Bus
Address . . . . . . . . . . . . . . . . . . .
15
2.3 ST125N/138N/157N
SCSI
Commands . . . . . . . . . . .
15
2.4 Error Recovery . . . . . . . . . . . . . . . . . . . . . . . .
16
2.5 Disc Format . . . . . . . . . . . . . . . . . . . . . . . . .
17
2.5.1
Formatting
and
Defect Management . . . . . . . . . .
17
2.5.2 Sector Interleave . . . . . . . . . . . . . . . . . . . .
17
2.6 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . .
17
2.
7 Incoming Inspection . . . . . . . . . . . . . . . . . . . . .
18
ST125N/138N/157N Product Manual,
Rev.
c
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 per Track: 13,312 13,312 11,264
Bytes per
Sector: 1,024 512 256
ST138N
Guaranteed Megabytes: 31.8 32.2 27.4
Bytes per
Cylinder: 52,224 52,736 44,800
Bytes per Track: 13,312 13,312 11,264
Bytes per
Sector: 1,024 512
256
ST157N
Guaranteed Megabytes:
48.2 48.6 41.3
Bytes per
Cylinder: 78,848 79,360 67,328
Bytes per Track: 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:
51
103 175
Sectors per Track: 13 26
44
Diagnostic
R/W
Cylinders: 1 1 1
Bytes per
Sector: 1,024
512 256
ST125N/138N/157NProduct Manual, Rev.
C
1
ST138N
Guaranteed
Sectors:
31,059
62,933
107,100
Sectors
per
Cylinder:
51
103
175
Sectors
per
Track:
13
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:
n
155
263
Sectors per
Track:
13
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
ts
a true statistical
average
of
at
least
5000
measurements
of
the time It
takes
to
execute
the
seek
speclfted
below
less
overhead.
Overhead
ts
measured
by
Issuing
a
no
motion
seek
from
the
highest
Logical
Block
Address
(LBA).
Seek
times
are
measured
by
monitoring
the
Busy
line
on
the
SCSI
bus.
All
measurements
assume
a block
size
of
512
bytes
and
an
ambient
temperature
of
25°
c.
Track-to-track
access
time
Is
an
average
of
all
possible
single track
seekS
tn
both
directions.
Average
access
time
ts
measured
by
executing
seek
commands
from
one
random
LBA
to
another.
Maximum
(fUll-stroke)
access
time
ts
half the time
needed
to
seek
from
LBA
o to the
maximum
LBA
and back to
LBA
o.
2
ST125N/138N/157N
Product
Manual,
Rev.
C
MLC-0
MLC-1
Track-to-Track:
Average:
Maximum
(Full-Stroke):
Average
Latency:
8
msec.
typ.
1 O
msec.
max.
38
msec.
typ.
40
msec.
max.
90
msec.
typ.
95
msec.
max.
8.33msec.
8msec.
typ.
1 O
msec.
max.
28
msec.
typ.
30
msec.
max.
70
msec.
typ.
75
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
be
specified. Controller overhead
Is
a
function of controller hardware
and
firmware
and
Is
typically
less than 3
msec.
1.4 Functional Specifications
ST125N ST138N ST157N
Tracks:
Cylinders:
Read/Write
Heads:
1,628
407
(0-406)
4
2,452
615
(0-614)
4
3,678
615
(0-614)
6
Discs:
Rotational
Speed:
Recording
Method:
Recording Density
(BPI):
Flux
Density
(FCI):
Track Density
(TPI):
Interface:
1/0 Data Transfer
Rate:
Int.
Data Transfer
Rate:
Nonrecoverable
Read
Errors:
2 2
3,600±0.5%
RLL
(2,7)
22,430
14,953
824
SCSI
Up
to 1.5
Mbytes/sec.
Up
to
7.5
Mblts/sec.
1 per 10
12
bits
read
ST125N/138N/157N Product
Manual,
Rev.
C
3
3
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