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Command Specifications
(1) Header
a.
Sense data length
This field indicates the length (number of bytes) of the parameter list (MODE
SENSE data) which it is possible to transfer to the INIT by this command.
The length of the "Sense data length" field itself is not included in this value.
Also, a value for a portion of data with a length that is supported by the IDD
is reported in this field for a parameter list of the type specified in the CDB
regardless of the specification of the "Transfer byte length" field in the CDB.
In order for the INIT to confirm that all the parameter list requested in the
command has been transferred, it should check whether the value which has
the length of the "Sense data length" field itself added to the value indicated
in this field is less than the value specified in the "Transfer byte length" field.
b.
Media type
X '00' (default type) is always reported in this field.
c.
WP bit
When this bit is "1," it indicates that a write operation to the disk media is
prohibited and when "0" is specified, it indicates that a write operation is
permitted.
d.
DPOFUA bit
When this bit is "0," it indicates that the IDD does not supports the DPO and
FUA bit. When this bit is "1," it indicates that the IDD supports the DPO and
FUA bits.
e.
Block descriptor length
This field indicates the "Block descriptor" length (byte length) which follows
after the header. The "Page descriptor" length is not included in this value.
The IDD always reports X '08' in this field if "0" is specified in the DBD bit
of this command's CDB, and thus indicates that one "Block descriptor" set
follows after the header. When "1" is specified in the DBD bit of the CDB,
the value of this field is X '00'.
(2) Block descriptor
The 8-byte "Block descriptor" indicates the logical attributes of the data format on
the disk media.
a.
Data block count
This field indicates the total number of logical data blocks (the block length
is shown in the "Data block length" field) existing in the "User Space" on the
disk media. This value does not include the number of spare sectors reserved
for alternate block processing.
4-76
C141-C009
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