HP C737990900 - Manual (Page 29)

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Status
A Status byte is sent from the drive to the host during the Status phase at the
end of each command as specified in the SCSI specification, unless the
command has been cleared by an ABORT message, by a BUS DEVICE RESET
message, or by a hard reset.
The Status bytes that the drive returns are as follows:
5 Req/Ack Offset
6 Transfer Width Exponent
7 Reserved (0) QAS_Req DT_Req IU_Req
7 6 5 4 3 2 1 0
Transfer Period
Factor
09h Transfer period of 12.5s (FAST-80). Only valid when DT transfers have been
requested
0Ch Transfer period of 50s (FAST-20) — LVD/SE drives only
19h Transfer period of 100s (FAST-10)
32h Transfer period of 200s (FAST-5)
Req/Ack Offset This has a maximum value of 255.
Transfer Width
Exponent
For ST transfers, this can be either 0 (Narrow) or 1 (Wide).
For DT transfers, it must be set to 1.
QAS_Req 0 This bit will be ignored and the drive will always return zero.
DT_Req This bit determines whether DT mode has been requested, in other words, packetized
data transfers.
IU-Req 0 This bit will be ignored and the drive will always return zero.
00h GOOD: This status indicates that the drive has successfully completed the command.
02h CHECK CONDITION: Any error, exception, or abnormal condition that causes sense data
to be set returns CHECK CONDITION . The REQUEST SENSE command should be sent
following this status to determine the nature of the error.
04h CONDITION MET: This status will never be returned by an HP Ultrium tape drive.