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Handling an Illegal CDB
If there is an error in the contents of a description (specification) in the CDB, or if there is an
error in the specifications in parameters transferred from the INIT, that command ends with a
CHECK CONDITION status. In the case of a command to change the data on the disk media,
when there is an error in the CDB's specifications, the disk media is not changed by that
command, but when there is an error in the parameters transferred in the DATA OUT phase,
the contents of the disk media in the range specified by the command may be changed. Also,
even in cases where there is an error in the CDB's specifications in a command accompanying
the DATA OUT phase, the DATA OUT phase is executed after the COMMAND phase is
terminated, but those data are not used.
specification of a WRITE command, the IDD executes the transfers several bytes of data (the
data length to be transferred is not specified), but those data are not written to the disk media.
Details are described in the individual command specifications in Chapter 3.
If there is an error in the CDB specification in a command which executes disconnect
processing (shown in item 1.3.3), the disconnect processing may be executed after the
COMMAND phase is terminated. In this case, reconnect processing is executed afterward and
the status (CHECK CONDITION) is reported.
Note:
If a CDB with an undefined group code (group 3, 4, 5) is specified, the IDD requests
transfer of 10 bytes in the COMMAND phase and if the group code [group 5] is specified,
it requests transfer of 12 bytes.
CONDITION) is reported.
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For example, if there is an error in the CDB
After that has been received, the status (CHECK
C141-E039-01EN
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