Commands72
10-byte version
CDB fields:
Specific status:
Following a successful Mode Select command, Unit Attention status is posted to all initiators other
than the initiator of the Mode Select command. The sense key is set to
UNIT ATTENTION. Additional
sense is set to 2A01h (mode parameters changed).
Mode parameter pages
Mode data is recovered from the drive by means of a MODE SENSE command. After modification,
it is returned to the drive via a
MODE SELECT command. In real-life, many hosts do not use MODE
SENSE
and return whatever MODE SELECT data suits them into the drive.
7 6 5 4 3 2 1 0
0 Operation Code (55h)
1 Reserved (0) PF Reserved (0) SP (0)
2 (MSB)
Reserved (0)
6 (LSB)
7 (MSB)
Parameter List Length
8 (LSB)
9 Control
PF Page Format
0The
MODE SELECT parameter data is not SCSI-2 mode page compatible. Only
the parameter header and block descriptor may be sent.
1 The parameter data is SCSI-2 mode-page compatible.
SP Save Pages
0 This bit is not supported and must be zero.
Parameter List
Length
0 No data is transferred.
>0 The length in bytes of the
MODE SELECT parameter list to be transferred.
