SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–23
5.9 CHANGE DEFINITION Command (40h)The CHANGE DEFINITION command sets the SCSI compliance for disk drives
with parallel SCSI interfaces to one of four different levels: SCSI-1, SCSI-1/CCS,
SCSI-2 or SCSI-3.
Bit
Byte
7 6 5 4 3 2 1 0
0Operation Code (40h)
1Reserved
2Reserved Save
3Rsv’d New Operating Definition
(0, 1, 2, 3, or 4 are legal values for Parallel SCSI Disk Drives)
4 - 7 Reserved
8Parameter Data Length
9Control
Figure 5–3 CHANGE DEFINITION Command Descriptor Block — Data Format