HP Surestore 400ex Optical Drive and Library SCSI-2 Command Reference - Page 140
Read Buffer Command 3CH, Mode Descriptions For 9.1 and 5.2 Gbyte Capacity Drives Only
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SCSI-2 Drive Commands Table 2-91 Table 2-92 Table 2-93 Table 2-94 SCSI-2 Drive Command Set Read Buffer Command (3CH) Read Buffer Descriptor Byte 7 6 5 4 3 2 1 0 0 Offset Boundary 1 Buffer Capacity (MSB) 2 Buffer Capacity 3 Buffer Capacity (LSB) Buffer Access Mode and ID Buffer Type Buffer RAM Buffer ID Mode 0 0 Buffer RAM Indicates the data buffer space used for the movement of data to and from the optical disk. Mode Descriptions (For 2.6 Gbyte Capacity Drives Only) Mode 0 Description Data retained for subsequent read buffer command Mode Descriptions (For 9.1 and 5.2 Gbyte Capacity Drives Only) Mode 0 2 3 Description Data Mode (same as Mode 2) Data Mode Descriptor Mode Chapter 2 2-103
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SCSI-2 Drive Command Set
Read Buffer Command (3CH)
Chapter 2
2-103
SCSI-2 Drive Commands
Buffer RAM
Indicates the data buffer space used for the movement
of data to and from the optical disk.
Table 2-91
Read Buffer Descriptor
Byte
7
6
5
4
3
2
1
0
0
Offset Boundary
1
Buffer Capacity (MSB)
2
Buffer Capacity
3
Buffer Capacity (LSB)
Table 2-92
Buffer Access Mode and ID
Buffer Type
Buffer ID
Mode
Buffer RAM
0
0
Table 2-93
Mode Descriptions (For 2.6 Gbyte Capacity Drives Only)
Mode
Description
0
Data retained for subsequent read buffer command
Table 2-94
Mode Descriptions (For 9.1 and 5.2 Gbyte Capacity Drives Only)
Mode
Description
0
Data Mode (same as Mode 2)
2
Data Mode
3
Descriptor Mode