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Cheetah 36XL Product Manual, Rev. E 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
4.2 SCSI performance characteristics (visible to user)
The values given in Section 4.2.1 apply to all models of the Cheetah 36XL family unless otherwise specified.
Refer to Section 9.10 and to the
SCSI Interface Product Manual
, part number 75789509, for additional timing
details.
4.2.1 Access time [5]
4.2.2 Format command execution time (minutes) [1]
4.2.3 Generalized performance characteristics
Data buffer transfer rate to/from disc media (one contiguous 512-byte sector):
Data buffer transfer rate to/from disc media (<1 track)
ST336705 ST318405 ST39205
Drive capacity 36.704 18.352 9.176 GByte (formatted, rounded off values)
Read/write heads 8 4 2
Bytes/track 241,128 241,128 241,128 Bytes (average, rounded off values)
Bytes/surface 4,577.5 4,577.5 4,577.5 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 19,036 19,036 19,036 Tracks (user accessible)
Tracks/inch 24,406 24,406 24,406 TPI
Peak bits/inch 381.28 381.28 381.28 KBPI
Internal data rate 320-490 320-490 320-490 Mbits/sec (variable with zone)
Disc rotational speed 10,022 10,022 10,022 r/min (+
0.5%)
Average rotational latency 2.99 2.99 2.99 msec
Including controller overhead
(without disconnect) [1] [3]
Not including controller overhead
(without disconnect) [1] [3]
Drive level Drive level
Read Write Read Write
msec msec
Average—Typical [2] 5.6 6.4 5.4 6.2
Single Track—Typical [2] 1.0 1.4 0.8 1.2
Full Stroke—Typical [2] 10.7 11.2 10.5 11
ST336705 ST318405 ST39205
Maximum (with verify) 36 18 9
Maximum (no verify) 19 9.5 4.5
Minimum sector interleave 1 to 1
Minimum [3] 31 MByte/sec
Average [3] 43 MByte/sec
Maximum [3] 50 MByte/sec
Minimum [3] 29 MByte/sec
Average [3] 40 MByte/sec
Maximum [3] 46 MByte/sec