Cheetah 73LP 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 73LP 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 512-byte sector):
ST373405 ST336605
Drive capacity 73.4 36.7 GByte (formatted, rounded off values)
Read/write heads 8 4
Bytes/track 397,385 397,385 By tes (average, rounded off values)
Bytes/surface 12,100 12,100 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 29,549 29,549 Tracks (user accessible)
Tracks/inch 38,000 38,000 TPI
Peak bits/inch 474 474 KBPI
Internal data rate 399-671 399-671 Mbits/sec (variable with zone)
Disc rotational speed 10,041 10,041 r/min (+0.5%)
Average rotational latency 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
ST373405
Average—Typical [2] 5.3 5.7 5.1 5.5
Single Track—Typical [2] 0.6 0.8 0.4 0.6
Full Stroke—Typical [2] 9.6 10.0 9.4 9.8
ST336605
Average—Typical [2] 4.9 5.4 4.7 5.2
Single Track—Typical [2] 0.6 0.8 0.4 0.6
Full Stroke—Typical [2] 8.8 9.3 8.6 9.1
ST373405 ST336605
Maximum (with verify) 120 90
Maximum (no verify) 60 45
Minimum sector interleave 1 to 1
Minimum [3]* 38.4 Mbytes/sec
Average [3] 52.0 Mbytes/sec
Maximum [3] 63.9 Mbytes/sec