Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications page 98

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. Prohibition or permission of a write
operation can be specified through the setting terminal (write protect) on the IDD. See "Product
Specifications/Installation Procedures" in the Product Manual concerning the setting terminal.
d. DPOFUA bit
When this bit is "0", it indicates that the IDD does not support the DPO and FUA bits. 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.
Furthermore, when this command specifies to transfer the "Default" value and "Variable" value, the
value shown in this field is X '00000000' (which means the maximum number of logical data blocks
that it is possible to rank in the "User Space").
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