specifications of a tyical disk

Specifications of a typical disk


Descriptions


Model number


ST136403LC

ST318203LC


Model name

Cheetah 36

Cheetah 18LP


Form Factor (width)

3.5-inch

3.5-inch


Weight

1.04 Kg

0.59 Kg




















Capacity/Interface


Formatted capacity

36.4 Gbytes, formatted

18.2 Gbytes, formatted


18.2 Gbytes, formatted

80-pin Ultra-2 SCSI

80-pin Ultra-2 SCSI


Configuration


Number of Discs (physical)

12

6


Number of heads (physical)

24

12


Total cylinders (SCSI only)

9,772

9,801


Total tracks (SCSI only)

N/A

117,612


Bytes per sector

512

512


Track Density (TPI)

N/A tracks/inch

12,580 tracks/inch


Recording Density (BPI, max)

N/A bits/inch

258,048 bits/inch




Performance

Transfer Rates


Internal Transfer Rate (min)

193 Mbits/sec

193 Mbits/sec


Internal Transfer Rate (max)

308 Mbits/sec

308 Mbits/sec


Formatted Int transfer rate (min)

18 Mbits/sec

18 Mbits/sec


Formatted Int transfer rate (max)

28 Mbits/sec

28 Mbits/sec


External (I/O) Transfer Rate (max)

80 Mbits/sec

80 Mbits/sec





Seek Times



Average seek time, read

5.7 msec typical

5.2 msec typical


Average seek time, write

6.5 msec typical

6 msec typical


Track-to-track seek, read

0.6 msec typical

0.6 msec typical


Track-to-track seek, write

0.9 msec typical

0.9 msec typical


Full disc seek, read

12 msec typical

12 msec typical


Full disc seek, write

13 msec typical

13 msec typical


Average Latency

2.99 msec

2.99 msec





Other


Default buffer (cache) size

1,024 Kbytes

1,024 Kbytes


Spindle Speed

10,000 RPM

10,016 RPM


Nonrecoverable error rate

1 per bits read

1 per bits read


Seek errors (SCSI)

1 per bits read

1 per bits read