Seagate ST11200N Product Manual page 20

12
______________________________________________________________________________________
5.3.1 Notes for sections 5.2 and 5.3.
[1] Execution time measured from receipt of the last Byte of the Command Descriptor Block (CDB) to the
request for a Status Byte Transfer to the Initiator (excluding latency and data transfer).
[2] Maximum times are specified over the worst case conditions of temperature, voltage margins and drive
orientation. When comparing specified seek times, care should be taken to distinguish between typical
seek times and maximum seek times. The best comparison is obtained by system benchmark tests
conducted under identical conditions. Maximum times do not include error recovery.
[3] Typical Seek values are measured under nominal conditions of temperature, voltage, and horizontal
orientation as measured on a representative sample of drives.
[4] Assumes no errors and no sector has been relocated.
[5] Rate measured from the start of the first sector transfer to or from the Host.
[6] Assumes the Initiator immediately sends Write Data to the drive when requested.
[7] Command execution requires a data transfer phase (data to or from the disc media). Assumes the
initiator is instantly ready to send/receive the data when the drive generates first request for a data byte
transfer, and assumes an average data transfer rate between the drive and the Initiator of 5 MBytes/
sec.
[8] All performance characteristics assume that automatic adaptive temperature compensation is not in
process when the SCSI command is received. A SCSI command being executed is not interrupted for
automatic adaptive temperature compensation. If adaptive thermal compensation is in process when a
SCSI command is received, the command is queued until the compensation for the specific head being
compensated completes. When compensation completes for the specific head being compensated, the
first queued SCSI command is executed. When execution of the first queued command is complete, the
drive continues the compensation for the remaining head(s). The above procedure continues until com-
pensation for all heads is completed, or until one minute has elapsed. If the compensation for all heads
is not complete in one minute, the drive performs compensation for all of the remaining heads sequen-
tially without any interruption. The drive initiates an automatic adaptive temperature compensation cycle
approximately once every 10 minutes and only when it detects a bus free condition between com-
mands. Automatic adaptive temperature compensation takes less than 0.1% of bus time. Automatic
temperature compensation also occurs at other times, but should be transparent to the user (e.g.,
during format, Rezero Command, at spindle up, during read error recovery, and during Reassign Block
functions). A Rezero command can be used to reset the thermal compensation timer back to its start so
that the host can know when the interruption for thermal compensation will occur.
Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D