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