Seagate Elite 9, Product Manual

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Elite 9 Product Manual, Rev. C 11
5.0 Performance-related characteristics
and features
This section provides performance-related characteristics and features of
Elite 9 drives.
5.1 Internal drive characteristics
Drive capacity, Mbytes unformatted 10,800
Read/write data heads 27
Bytes per track, average 77,700
Bytes per surface, Mbytes unformatted 400
Cylinders/tracks per surface, user accessible 4,925
Tracks per inch 3,921
Servo heads 1
Internal data rate, Mbits/sec, variable with zone 44 to 65
Disc rotation speed 5,400
±
0.5%
Average rotational latency, msec 5.55
5.2 SCSI seek performance characteristics
All performance characteristics assume that automatic adaptive thermal
compensation is not in process when the drive receives the SCSI command.
Automatic adaptive thermal compensation will not interrupt an active SCSI
command. If adaptive thermal compensation is in process when a SCSI
command is received, the command is queued until compensation
completes. When compensation completes for the head, the first queued
SCSI command executes, and the drive continues compensation for the
remaining head(s).
The above procedure continues until compensation for all heads has
completed, or until 10 minutes have elapsed. The drive initiates an automatic
adaptive thermal compensation cycle once on power-up before completing
its initialization sequence, once after 1 minute from the end of initialization,
and then once approximately every 10 minutes. Automatic thermal
compensation occurs at other times but should be transparent to the user
(e.g., during format, at Re-Zero command, at spindle-up, during read-error
recovery, and during reassign-block functions). You can use the Re-Zero
command to reset the thermal compensation timer to its start to let the host
know when the interruption for thermal compensation will occur.
Refer to Section 11.9 and to the
SCSI-2 Interface Product Manual (part
number 77738479) for additional timing details.