Seagate MEDALIST 1080SL User manual

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Medalist 1080sl
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SCSI Interface Drive
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Product Manual
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Medalist 1080sl
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SCSI Interface Drive
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Product Manual
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© 1995 Seagate Technology, Inc. All rights reserved
Publication Number: 36321-101, Rev. A, August 1995
Seagate, Seagate Technology and the Seagate logo are registered
trademarks of Seagate Technology, Inc. MedalistSL is a trademark of
Seagate Technology, Inc. Other product names are trademarks or
registered trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings
or specifications. No part of this publication may be reproduced in any
form without written permission from Seagate Technology, Inc.

Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Quick specification chart . . . . . . . . . . . . . . . . . . . . . . 2
1.0 Specifications summary . . . . . . . . . . . . . . . . . . . . . 4
1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Physical geometry . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Functional specifications . . . . . . . . . . . . . . . . . . . . 4
1.4 Physical dimensions . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5.1 Read look-ahead and caching . . . . . . . . . . . . . . 5
1.6 Start and stop time . . . . . . . . . . . . . . . . . . . . . . . 6
1.6.1 Power-up sequence . . . . . . . . . . . . . . . . . . . . 6
1.6.2 Power-down sequence . . . . . . . . . . . . . . . . . . 7
1.6.3 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.7 Power management . . . . . . . . . . . . . . . . . . . . . . 7
1.7.1 Power consumption . . . . . . . . . . . . . . . . . . . . 8
1.7.2 Voltage tolerance . . . . . . . . . . . . . . . . . . . . . 8
1.7.3 Input noise . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.8 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.8.1 Ambient temperature . . . . . . . . . . . . . . . . . . . 9
1.8.2 Temperature gradient . . . . . . . . . . . . . . . . . . . 9
1.8.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.8.4 Relative humidity . . . . . . . . . . . . . . . . . . . . 10
1.9 Shock and vibration . . . . . . . . . . . . . . . . . . . . . 10
1.10 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.11 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.12 Agency listings . . . . . . . . . . . . . . . . . . . . . . . 11
1.13 FCC verification . . . . . . . . . . . . . . . . . . . . . . . 11
Medalist 1080sl SCSI Product Manual, August 1995 iii

2.0 Hardware and interface . . . . . . . . . . . . . . . . . . . . 15
2.1 SCSI-2 compatibility . . . . . . . . . . . . . . . . . . . . . 15
2.2 Handling and static-dischargeprecautions . . . . . . . . . 15
2.3 Electrical interface . . . . . . . . . . . . . . . . . . . . . . 16
2.4 SCSI interface connector . . . . . . . . . . . . . . . . . . 17
2.4.1 SCSI interface connector pin assignments . . . . . . . 18
2.5 Interface cable requirements . . . . . . . . . . . . . . . . . 19
2.5.1 Interface cable length for asynchronous operation . . . 21
2.5.2 Interface cable for Fast SCSI operation . . . . . . . . . 21
2.6 Options jumper block . . . . . . . . . . . . . . . . . . . . . 21
2.6.1 SCSI address . . . . . . . . . . . . . . . . . . . . . . 22
2.6.2 Active Termination . . . . . . . . . . . . . . . . . . . 22
2.6.3 Terminator power source selection . . . . . . . . . . . 22
2.6.4 Parity enable option . . . . . . . . . . . . . . . . . . . 23
2.6.5 Start/stop option . . . . . . . . . . . . . . . . . . . . . 23
2.6.6 Remote LED connection . . . . . . . . . . . . . . . . 23
2.7 Daisy chaining . . . . . . . . . . . . . . . . . . . . . . . . 23
2.8 Hot-plugging . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.9 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 24
3.0 Command set . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.1 Command descriptor block . . . . . . . . . . . . . . . . . . 27
3.2 Status byte . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3 Supported commands . . . . . . . . . . . . . . . . . . . . 29
3.4 Group 0 commands . . . . . . . . . . . . . . . . . . . . . 30
3.4.1 Test Unit Ready command (00H) . . . . . . . . . . . . 30
3.4.2 Rezero Unit command (01H) . . . . . . . . . . . . . . 30
3.4.3 Request Sense command (03H) . . . . . . . . . . . . 30
3.4.4 Format Unit command (04H) . . . . . . . . . . . . . . 32
3.4.5 Reassign Blocks command (07H) . . . . . . . . . . . . 37
3.4.6 Read command (08H) . . . . . . . . . . . . . . . . . . 39
3.4.7 Write command (0AH) . . . . . . . . . . . . . . . . . . 40
iv Medalist 1080sl SCSI Product Manual, August 1995

3.4.8 Seek command (0BH) . . . . . . . . . . . . . . . . . . 41
3.4.9 Inquiry command (12H) . . . . . . . . . . . . . . . . . 41
3.4.10 Mode Selectcommand (15H) . . . . . . . . . . . . . 42
3.4.11 Reserve command (16H) . . . . . . . . . . . . . . . 45
3.4.12 Release command (17H) . . . . . . . . . . . . . . . . 46
3.4.13 Mode Sense command (1AH) . . . . . . . . . . . . . 47
3.4.14 Start/Stop Unit command (1BH) . . . . . . . . . . . . 50
3.4.15 Receive Diagnostic Results command (1CH) . . . . . 51
3.4.16 Send Diagnostic command (1DH) . . . . . . . . . . . 52
3.5 Group 1 commands . . . . . . . . . . . . . . . . . . . . . 53
3.5.1 Read Capacity command (25H) . . . . . . . . . . . . . 53
3.5.2 Read Extended command (28H) . . . . . . . . . . . . 54
3.5.3 Write Extended command (2AH) . . . . . . . . . . . . 55
3.5.4 Seek Extended command (2BH) . . . . . . . . . . . . 57
3.5.5 Write and Verify command (2EH) . . . . . . . . . . . . 57
3.5.6 Verify command (2FH) . . . . . . . . . . . . . . . . . 58
3.5.7 Read Defect Data command (37H) . . . . . . . . . . . 58
3.5.8 Write Data Buffer command (3BH) . . . . . . . . . . . 60
3.5.9 Read Data Buffer command (3CH) . . . . . . . . . . . 62
3.5.10 Read Long command (3EH) . . . . . . . . . . . . . . 63
3.5.11 Write Long command (3FH) . . . . . . . . . . . . . . 63
3.6 Group 2, 3 and 4 commands . . . . . . . . . . . . . . . . . 64
3.7 Group 5 and 6 commands . . . . . . . . . . . . . . . . . . 64
3.8 Group 7 commands . . . . . . . . . . . . . . . . . . . . . 65
Appendix A. Supported messages . . . . . . . . . . . . . . . . 67
A.1 Single-byte messages . . . . . . . . . . . . . . . . . . . . 67
A.2 Synchronous data transfer request message (01H) . . . . . 67
Appendix B. Sense data . . . . . . . . . . . . . . . . . . . . . . 69
B.1 Additional sense data . . . . . . . . . . . . . . . . . . . . 69
B.2 Sense key . . . . . . . . . . . . . . . . . . . . . . . . . . 70
B.3 Additional sense code and additional sense code qualifier . 72
Medalist 1080sl SCSI Product Manual, August 1995 v

Appendix C. Mode pages . . . . . . . . . . . . . . . . . . . . . 77
C.1 Error Recovery page (01H) . . . . . . . . . . . . . . . . . 79
C.2 Disconnect/Reconnect page (02H) . . . . . . . . . . . . . 81
C.3 Format Device page (03H) . . . . . . . . . . . . . . . . . . 82
C.4 Rigid Disc Geometry page (04H) . . . . . . . . . . . . . . 85
C.5 Verify error recovery page (07H) . . . . . . . . . . . . . . . 87
C.6 Caching page (08H) . . . . . . . . . . . . . . . . . . . . . 89
C.6.1 Read look-ahead and caching . . . . . . . . . . . . . 89
C.6.2 Write caching and write merging . . . . . . . . . . . . 89
C.6.3 Caching page description . . . . . . . . . . . . . . . . 90
C.7 Control Mode page (0AH) . . . . . . . . . . . . . . . . . . 93
C.8 Notch page (0CH) . . . . . . . . . . . . . . . . . . . . . . 95
C.9 Cache Control page (38H) . . . . . . . . . . . . . . . . . . 97
C.10 Soft ID page (Flash memory) (3CH) . . . . . . . . . . . . 98
C.11 Operating page(Flash memory) (00H) . . . . . . . . . . . 99
Appendix D. Inquiry data . . . . . . . . . . . . . . . . . . . . 101
D.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . 101
D.2 Vital product data pages . . . . . . . . . . . . . . . . . . 104
D.2.1 Unit Serial Number page (80H) . . . . . . . . . . . . 105
D.2.2 Implemented Operating Definition page (81H) . . . . 105
D.2.3 Firmware Numbers page (C0H) . . . . . . . . . . . . 106
D.2.4 Date Code page (C1H) . . . . . . . . . . . . . . . . 107
D.2.5 Jumper Settings page (C2H) . . . . . . . . . . . . . 107
Appendix E. Timing diagrams . . . . . . . . . . . . . . . . . . 109
vi Medalist 1080sl SCSI Product Manual, August 1995

Figures
Figure 1. Typical startup current profile . . . . . . . . . . . . . . . . 6
Figure 2. Single-ended transmitter and receiver . . . . . . . . . . 16
Figure 3. ST51080N connectors . . . . . . . . . . . . . . . . . . 17
Figure 4. Options jumper block settings . . . . . . . . . . . . . . 20
Figure 5. ST51080N mounting dimensions . . . . . . . . . . . . . 25
Figure 6. Arbitration, selection (without ATN) and command . . . 109
Figure 7. Arbitration, selection (with ATN) and message out . . . 110
Figure 8. Identify message out to command . . . . . . . . . . . 111
Figure 9. Command descriptor block transfer . . . . . . . . . . 112
Figure 10. Command, status, command complete message and
bus free . . . . . . . . . . . . . . . . . . . . . . . . 113
Figure 11. Last command byte, disconnect message, bus free
and reselection . . . . . . . . . . . . . . . . . . . . 114
Figure 12. Arbitration, reselection and message in . . . . . . . . 115
Figure 13. Reselection, status, command complete and busfree 116
Figure 14. Last command byte to data in . . . . . . . . . . . . . 117
Figure 15. Last command byte to data out . . . . . . . . . . . . 118
Figure 16. Reselect identify message to data in . . . . . . . . . 119
Figure 17. Data in block transfer . . . . . . . . . . . . . . . . . 120
Figure 18. Data out block transfer . . . . . . . . . . . . . . . . 121
Figure 19. Last data byte, save pointer message and
disconnect message . . . . . . . . . . . . . . . . . 122
Figure 20. Data in, status, command complete message and
bus free . . . . . . . . . . . . . . . . . . . . . . . . 123
Figure 21. Synchronous timing . . . . . . . . . . . . . . . . . . 124
Figure 22. Synchronous write timing . . . . . . . . . . . . . . . 125
Medalist 1080sl SCSI Product Manual, August 1995 vii

Introduction
This manual describes the functional, mechanical and interface specifi-
cationsfortheMedalist1080slSCSIharddiscdrive.TheMedalist1080sl
SCSI is referred to throughout this manual by its model number,
ST51080N.
The ST51080N is a high-capacity, high-performance, energy-efficient
SCSI drive that comes in the mini 3.5-inch form-factor.
The drive uses a high-performance SCSI-2 interface that supports an
asynchronous external transfer rate of up to 5 Mbytes persecond anda
synchronous external transfer rate of up to 10 Mbytes per second.
The interface is supported with a 128-Kbyte segmented cache and
embeddedservotechnology.Thesegmentedcacheaidstheflowofread
and write data. The embedded servo allows for accurate positioning of
the heads over the data and eliminates periodic thermal recalibration to
assure data transfer without interruption.
The ST51080N conforms to the standard 3.5-inch footprint but have a
0.75-inch (19 mm) height profile and a 5.0-inch depth profile. The lower
height andshorter depth gives the designer or integrator more room for
air circulation, other peripherals or a smaller drive bay.
The following is a summary of the drive’s features:
Capacity
•1.08 Gbytes formatted
Performance
•Uses the SCSI-2 interface
•5,376-RPM rotational speed
•128-Kbyte segmented buffer
•12.5-msec average seek time
Acoustics
•30-dBA idle acoustic sound level
Mini 3.5-inch form-factor
•19-mm height profile
•Fits standard 3.5-inch footprint
Medalist 1080sl SCSI Product Manual, August 1995 1

Quick specification chart
The following table serves as a quick reference for the ST51080N
performance specifications. These and other specifications are dis-
cussed in the Specification summary section following the table.
Drive specification ST51080N
Formatted capacity (Mbytes) (×106bytes) 1,080.23
Total sectors 2,109,840
Bytes per sector 512
Sectors per track (average) 115
Physical cylinders 4,826
Physical read/write heads 4
Physical disc 2
Recording density (bits per inch, max) 73,344
Track density (tracks per inch) 4,923
Spindle speed (RPM) 5,376 ±0.5%
Internal data-transfer rate (Mbits per second max) 33 MHz to 65 MHz
External transfer rate (Mbytes per second max) 5.0 asynchronous
10.0 synchronous
Cache buffer (Kbytes) 128
Height, inches max (mm) 0.748 (19.0)
Width, inches max (mm) 4.01 (102.8)
Depth, inches max (mm) 5.00 (127.0)
Typical weight, lb (g) 0.750 (340.2)
Track-to-track seek time read (msec typical) 3.5
Track-to-track seek time write (msec typical) 4.5
Average seek time read (msec typical) 12.5
Average seek time write (msec typical) 15.5
Full-stroke seek time read (msec typical) 25.0
Full-stroke seek time write (msec typical) 27
Average latency (msec) 5.6
Power-on to ready (sec typical) 20
continued
2 Medalist 1080sl SCSI Product Manual, August 1995

Drive specification ST51080N
Spinup current: +12V (max) 1.32A
Seek power (typical) 7.11W
Read/Write power (typical) 5.14W
Idle power (typical) 4.9W
Voltage tolerance (including noise): +5V ±5%
Voltage tolerance (including noise): +12V ±5%
Ambient temperature, operating (°C) 5° to 55°C
Temperature gradient , operating (°C per hour max) 20°C
Relative humidity, operating gradient (max) 10% per hr
Relative humidity, operating 8% to 80%
Wet bulb temperature, operating (noncondensing) 29.4°C
Altitude, operating –1,000 to 10,000 ft.
Shock, normal operating (Gs max for 11 msec) 2 Gs
Vibration (Gs max at 22–350 Hz without nonrecoverable
errors), operating 0.75 Gs 0 to Peak
Vibration(Gsmaxat 22–350Hzwithnophysicaldamage
incurred), nonoperating 4 Gs 0 to Peak
Drive acoustics, Idle mode (dBA) 30 dBA
Drive acoustics, seeking (dBA) 34 dBA
Nonrecoverable read errors
(per bits transferred) 1013
Mean time between failures (power-on hours) 300,000
Contact start-stop cycles 40,000
Service life (years) 5
continued from previous page
Medalist 1080sl SCSI Product Manual, August 1995 3

1.0 Specifications summary
1.1 Formatted capacity
Thecapacitiesspecifiedheredonotincludesparesectorsandcylinders.
The media contains one spare sector per track and two spare cylinders
per drive.
Formatted capacity (Mbytes1) 1080.23
Total sectors 2,109,840
1.2 Physical geometry
Discs 2
Read/write heads 4
Cylinders 4,826
1.3 Functional specifications
Interface Fast SCSI-2
Zone Bit Recording method RLL (1,7)
External data transfer rate
(Mbytes per sec, max) 5.0 asynchronous 10.0 synchronous
Internal data transfer rate
(Mbits per sec) 33 to 65
Spindle speed (RPM) 5,376 ±0.5%
Bytes per sector 512
Track density (TPI) 4,923
Recording density
(BPI, max) 73,344
1. One Mbyte equals 1,000,000 bytes.
4 Medalist 1080sl SCSI Product Manual, August 1995

1.4 Physical dimensions
Height (max) 0.748 inches (19 mm)
Width (max) 4.00 inches (102.1 mm)
Depth (max) 5.00 inches (127.0 mm)
Weight (max) 0.75 lb (340.2 g)
1.5 Seek time
All seek time measurements are taken under nominal conditions of
temperature and voltage with the drive mounted horizontally. In the
following table:
•
Track-to-track seek time is the average of all possible single-track
seeks in both directions.
•
Average/typical seek time is a true statistical random average of at
least 5,000 measurements of seeks in both directions between ran-
dom cylinders, less overhead.
•
Full-stroke seek time is one-half the time needed to seek from logical
block address zero (LBA 0) to the maximum LBA and back to LBA 0.
Track-to-track
seek time typ2Average/typical
seek time3Full-stroke
seek time typ4Average latency
4.5 msec read 12.5 msec read 25.0 msec read 5.6 msec
3.5 msec write 15.5 msec write 27.0 msec write
Note. Host overhead varies between systems and cannot be specified.
Driveinternaloverheadismeasuredbyissuinga no-motionseek.
Drive overheadis typically less than 1.0 msec.
1.5.1 Read look-ahead and caching
Thedriveusesalgorithmsthatimproveseekperformancebystoringdata
in a buffer and processing it at a more convenient time. Three methods
are used: read look-ahead, read caching and write caching. These are
described in Appendix C.6.
2. All possible one track seeks are divided into the time required to perform those seeks.
Only the mechanism time is used; interface overhead is excluded.
3. All possible seeks are divided into the time required to perform those seeks. Only the
mechanism time is used; interface overhead is excluded.
4. The average of 1000 full stroke seeks is used in this computation. Only the mechanism
time is used; interface overhead is excluded.
Medalist 1080sl SCSI Product Manual, August 1995 5

1.6 Start and stop time
If the motor start option is disabled, the drive becomes ready within
20 seconds after power is applied. If the motor start option is enabled,
the drive becomes ready within 20 seconds after it receives the Motor
Start command. If the drive receivesa command to spin down or power
is removed,the drive stops within 15 seconds.
1.6.1 Power-up sequence
The following typical power-up sequence is provided to assist in evalu-
ating drive performance. This information does not constitute a specifi-
cation or a performance guarantee.
1. Power is applied to the disc drive.
2. The LED comes on for about 1 second.
3. Depending on whether there is a jumper installed on pins 15 and 16
of the options jumperblock (J8) shown in Figure 3 on page17, either
of the following sequences occurs:
a. If a jumper is not installed, the remote start option is notenabled,
and the drive beginsto spin up as soon as power is applied.
b. If a jumper is installed,the remote start optionis enabled,and the
drivebeginstospinupwhenthehostcommandsthemotortostart.
4. Within250msecafterpowerisapplied,thedrive respondstotheTest
Unit Ready, Request Sense, Mode Sense and Inquiry commands.
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1
T1
T2
T3
T4 T5
T6
T7
23456789
Amps
Seconds
Figure 1. Typical startup current profile
6 Medalist 1080sl SCSI Product Manual, August 1995

5. The drive begins to lock in speed-control circuits.
6. The actuator lock releases the actuator.
7. The spindle motor reachesoperatingspeedin about5 seconds. After
5 seconds,there are no speed variations.
8. The drive performs velocity adjustment seeks.
9. The drive seeks track 0 and becomes ready.
1.6.2 Power-down sequence
The following typical power-down sequence is provided to assist in
evaluating drive performance. This information does not constitute a
specification or a performance guarantee.
1. The power cable is unplugged from the drive,or the drive receives a
command to spin down.
2. Within 3 seconds after the motor begins to spin down, the actuator
lock engages, producing a sound.
3. The spindle stops within 15 seconds, whether the power cable is
unplugged from the drive or the drive receives the power-down
command.
1.6.3 Auto-park
Upon power-down, the read/write heads automatically move to the
landingzone.Theheadsparkbeyondthemaximumdatacylinder.When
power is applied, the heads recalibrate to track 0.
Caution. Do not move the drive until the spindle motor has come to a
complete stop; otherwise, you may damage the drive.
1.7 Power management
The drive supports power-management modes that reduce its overall
power consumption. The drive automatically changes from one mode to
another in response to interface activity. You do not need to change any
parameters or send any special commands to make the drive change
modes. The power-management modes are described below.
•Spinup. Spinup is defined as the period during which the spindle is
coming up to operating speed. The power consumed in this mode is
equivalent to the average power during the first 10 seconds after the
drive begins to spin up.
Medalist 1080sl SCSI Product Manual, August 1995 7

•Seeking. The servo electronics are active, and the headsare moving
to a specific location on the disc. The read/write electronics are
powered-down.Thepowerconsumedinthismodeisequivalenttothe
average power measured while executing random seeks with a 2-
revolution (26.6 msec) dwell between seeks. The drive enters this
mode from the Idle mode.
•Read/Write. The drive is reading or writing. All electronics are active
and the heads are on track.
•Idle. The motor is up to speed and the drive is in track follow mode.
1.7.1 Power consumption
Values in the table below were measured at the drive power connector
with an RMS DC ammeter. The terminating resistors are disabled, and
terminator poweris supplied through the SCSI connector. All values are
measured 10 minutes after the drive spins up except as noted.
During
Spinup Seeking Read/ Write Idle
Current at +12V
Amps peak 1.32 — — —
RMS amps typ — 0.393 0.221 0.219
Watts typ — 4.72 2.65 2.63
Current at +5V
RMS amps typ — 0.477 0.498 0.471
Watts typ — 2.39 2.49 2.36
Power
Total watts typ — 7.11 5.14 4.99
1.7.2 Voltage tolerance
+5V +12V
Voltage tolerance
(including noise) ±5% ±5%
8 Medalist 1080sl SCSI Product Manual, August 1995

1.7.3 Input noise
+5V +12V
Voltage tolerance
(including noise) ±5% ±5%
Input noise frequency
(max) 25 MHz 25 MHz
Input noise
(max, peak-to-peak) 100 mV 240 mV
1.8 Environmental
This section specifies acceptable environmental conditions for the drive.
The operating specifications assume that the drive is powered up. The
nonoperating specifications assume that the drive is packaged as it was
shipped from the factory.
1.8.1 Ambient temperature
Operating 5°C to 55°C (41°F to 131°F)
Nonoperating –40°C to 70°C (–40°F to 158°F)
1.8.2 Temperature gradient
Operating 20°C per hour (36°F per hour)
Nonoperating 30°C per hour (54°F per hour)
1.8.3 Altitude
Operating –1,000 ft to 10,000 ft (–305 m to 3,048 m)
Nonoperating –1,000 ft to 40,000 ft (–305 m to 12,192 m)
Medalist 1080sl SCSI Product Manual, August 1995 9

1.8.4 Relative humidity
Operating 8% to 80% noncondensing
Maximum wet bulb 29.4°C (84.9°F)
Operating gradient, max 10% per hour
Nonoperating 5% to 95%noncondensing
Maximum wet bulb 35°C (95.0°F)
1.9 Shock and vibration
Allshock andvibration specificationsassumethat the inputs are measured
at the drive mounting screws. Shock measurements are based on an
11-msec, half sine wave shock pulse, not to be repeated more than twice
persecond.
During normal operating shock and vibration, there is no physical dam-
age to the drive or performance degradation.
During abnormal operating shock and vibration, there is no physical
damageto the drive, althoughperformancemay be degraded during the
shockorvibrationepisode.Whennormaloperatingshocklevelsresume,
the drive meets its performance specifications.
During nonoperating shock and vibration, the read/write heads are
positioned in the shipping zone.
Normal
operating Abnormal operating Nonoperating
Shock 2 Gs 10 Gs 75 Gs
5–22 Hz vibration 0.020-inch
displacement 0.030-inch displacement 0.160-inch displacement
22–350 Hz vibration 0.50 Gs 0.75 Gs 4.00 Gs
1.10 Acoustics
Sound pressure is measured at idle from 1 meter above the drive top
cover.
Idle Seek
Sound pressure, typ 30 dBA 34 dBA
Sound pressure, max 34 dBA 38 dBA
10 Medalist 1080sl SCSI Product Manual, August 1995