Fujitsu MAP3147 Scsi Logical Interface Specifications page 176

Command Specifications
The IDD is not supported a "PBdata" bit. Therefore, if "PBdata" bit is one, this command is
terminated with CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in CDB
[=24-00]).
A "Relative Address (RelAdr)" bit of zero indicates that the "Logical Block Address" field specifies
the first logical block of the range of logical blocks for this command.
A "RelAdr" bit of one indicates that the "Logical Block Address" field is a two's complement
displacement. But the IDD is not supported this bit. Therefore, if this bit is one, this command is
terminated with CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in CDB
[=24-00]).
The "Number of Blocks" field specifies the number of contiguous logical blocks to be written. A
"Number of Blocks" field of zero requests that all the remaining logical blocks onthe medium be
written.
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