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Command Specifications
230 C141-C013
b. Defect list (D List)
The defect list (D List) contains defect position information about the disk
media specified by the INIT and is configured from one or more "Defect
descriptors." "Defect descriptors must be described in the format specified in
the "Defect List Format" field of the CDB.
The configurations which it is possible to specify for the "Defect descriptors"
in the defect list (D List), and their description formats, are shown below.
Furthermore, it is possible only to specify User Space address information on
the disk media in the Defect list (D List).
− Byte distance from the index format defect descriptor
Table 4.38 lists this description format of the defect descriptor. Defect
descriptor in this format specifies the cylinder number, head (track)
number and byte distance to the top byte of those data (8 bytes), of the
data which includes defective bits, on the disk media. One defect is
treated as a defect with a length of 8 bytes (64 bits length). Therefore,
for defects with a length which exceeds 8 bytes, 2 or more defect
descriptors must be specified. When multiple defect descriptors are
specified, the cylinder number must be specified in the top position, the
byte distance from the index in the bottom position, and the defect
positions listed in ascending order.
Table 4.38 Defect descriptor: byte distance from index format
Bit
Byte
7 6 5 4 3 2 1 0
0 Cylinder No. (MSB)
1 Cylinder No.
2 Cylinder No. (LSB)
3 Head No.
4 Byte distance from index to defect position (MSB)
5 Byte distance from index to defect position
6 Byte distance from index to defect position
7 Byte distance from index to defect position (LSB)