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Command Specifications
3 -
90
C141-E167
b. G List (grown list) bit
When this bit is “1,” it indicates that G List defect data are included in the defect descriptor list
that is actually transferred to the INIT. When it is “0,” it indicates that the G List defect data are
not included. See 3) of item (2).)
c. Defect list format
This field indicates the description format of the defect descriptor list that is actually transferred
to the INIT. It is possible for the IDD to transfer defect data in 3 different formats which it can
specify in the CDB, and the values in this field are the same as the values specified in the
“Defect List Format” field in the CDB.
d. Defect list length
This field follows the 4-byte header and indicates the total number of bytes of defect descriptor
list that can be transferred. It has either 4 or 8 bytes, depending on the format of the defect
descriptor. Also, the values shown in this field are the total number of bytes described in the
“Defect List Format” which specifies the specified type (P List or G List) of defect data,
regardless of the value specified in the “Transfer byte length” field in the CDB. The INIT
should check whether the value shown in this field plus 4 is a smaller value than that specified in
the “Transfer byte count” field in the CDB in order to confirm that all the defect data requested
in this command have been transferred. Also, since the value shown in this field is divided by
the number of bytes (4 or 8) per defect descriptor (quotient), the INIT can know the number of
defects on the disk media.
(2) Defect descriptor list
The data transferred after the 4-byte header is the “Defect descriptor” list (Defect data) in which the
defect position information are described with the type and format specified in the CDB. One
“Defect descriptor” has a length of 4 bytes when in the “Block address format,” and a length of 8
bytes when in the “Byte distance from the index format” and “Physical sector address format.” The
“Defect descriptors” do not necessarily transfer defect position information in ascending order.
See the description of the FORMAT UNIT command (Section 3.3.1) concerning the configuration
and contents of the “Defect descriptor” in each format.
Notes: Precautions for use of command
1. When “1” is specified in both the “P List” bit and the “G List” bit in the CDB, and transfer
of both the P List and G List is requested, the IDD first of all transfers the P List, then
transfers the G List afterward (merging of the defect information in the two lists is not
performed).
2. When “0” is specified in both the “PList” bit and the “GList” bit in the CDB, only the
header is transferred by that command, but the following information is shown in the header
at this time.
• PList bit: “0”
• GList bit: “0”