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SCSI Description
Maxtor Atlas 10K III 5-33
An application client can request command support data by setting the CmdDt bit of
the INQUIRY command to 1, and specifying the SCSI operation code of the
Command Descriptor Block (CDB) for which it wants information.
Format of the command support data and definitions of the fields follow in Table 5-
39, Table 5-40, and Table 5-41.
Command Support Data Page-Data Format
Command Support Data Page-Field Descriptions
0 Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1 Reserved Support
2 ISO Version ECMA Version ANSI-Approved Version
3 – 4 Reserved
5CDB Size (m – 5)
6 – m
(MSB)
CDB Usage Data
(LSB)
Support
The value of the Support field describes the type of support that the disk
drive provides for Command Support Data.
Value
Description
000b
Data about the requested SCSI operation
code is not currently available. In this
case, all data after Byte 1 is undefined.
001b
The device does not support the SCSI
operation code requested. In this case,
all data after Byte 1 is undefined
010b Reserved
011b
The device supports the SCSI operation
code in conformance with the SCSI stan-
dard.
100b Vendor-Specific
101b
The device supports the SCSI operation
code, but in a vendor-specific manner
110b Vendor-Specific
111b Reserved
ISO-Version Must be 0.
ECMA-Version Must be 0.
ANSI-Approved
Version
Minimum operating definition for supported command.
CDB Size
This field contains the number of bytes in the CDB for the Operation Code
being requested and the size of the CDB Usage Data in the data that is
returned in response to the INQUIRY.