Seagate 15K.3 - Cheetah - Hard Drive, Руководство по эксплуатации продукта

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8 Cheetah 15K.3 SCSI Product Manual, Rev. G
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 15K.3 SCSI family unless otherwise spec-
ified. Refer to Section 9.10 and to the
SCSI Interface Product Manual
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):
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide 5.0 Mbytes/sec [4]
Maximum instantaneous two bytes wide 10.0 Mbytes/sec [4]
Synchronous transfer rate
In low voltage differential (LVD) interface mode 5.0 to 320 Mbytes/sec
ST373453 ST336753 ST318453
Drive capacity 73.4 36.7 18.4 GByte (formatted, rounded off values)
Read/write heads 8 4 2
Bytes/track 377,770 377,770 377,770 Bytes (average, rounded off values)
Bytes/surface 12,046 12,046 12,046 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 31,310 31,310 31,310 Tracks (user accessible)
Tracks/inch 64,000 64,000 64,000 TPI
Peak bits/inch 533 533 533 KBPI
Internal data rate 632-891 632-891 632-891 Mbits/sec (variable with zone)
Disc rotational speed 15k 15k 15k r/min
Average rotational latency 2.0 2.0 2.0 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] 3.8 4.1 3.6 3.9
Single Track–Typical [2] 0.40 0.60 0.20 0.40
Full Stroke–Typical [2] 6.7 7.1 6.5 6.9
ST373453 ST336753 ST318453
Maximum (with verify) 90 60 30
Maximum (no verify) 45 30 15
Minimum sector interleave 1 to 1
Minimum [3]* 56.1 MBytes/sec
Maximum [3] 86.0 MBytes/sec