Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 270)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.32.2 One_command parameter data format
The Report Supported Operation Codes one_command parameter data format contains information about the CDB and a usage
map for bits in the CDB for the command specified by the Reporting Options, Requested Operation Code, and Requested Ser-
vice Action fields in the Reported Supported Operation Codes CDB.
The Support field is defined in the table below.
CDB Size contains the size of the CDB Usage Data field in the parameter data, and the number of bytes in the CDB for the
command requested.
CDB Usage Data contains information about the CDB for the command requested. The first byte of the CDB Usage Data
field contains the operation code for the command. If the command contains a service action, then that service action code is
returned in the same location as the Service Action field of the command CDB. All other bytes of the CDB Usage Data field
contain a usage map for bits in the CDB for the command requested.
The bits in the usage map have a one-for-one correspondence to the CDB for the command requested. If the drive evaluates a
bit in the CDB, the usage map will contain a one in the corresponding bit position. The usage map will contain a zero in the
corresponding bit position for any field treated as ignored or reserved.
Byte
Bit
7 6 5 4 3 2 1 0
0 Reserved = 0
1 Reserved = 0 Support
2-3 CDB Size (n-3)
4-n CDB Usage Data
Recording Option Description
000b
Data about the requested command is not currently available. All data after byte 1 is not
valid. A subsequent request for command support data may be successful.
001b The requested command is not supported. All data after byte 1 is not valid.
010b Reserved.
011b The requested command is supported in conformance with the standard.
100b Reserved
101b The requested command is supported in a vendor specific manner.
110b-111b Reserved.