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4.3 Format Commands
C141-C013 231
− Physical sector address format defect descriptor
Table 4.39 lists this description format of the defect descriptor. A defect
descriptor with this format specifies the physical sector number of the
data block which includes the defect on the disk media together with the
cylinder No. and the head (track) No. When specifying multiple defect
descriptors, the cylinder No. must be specified in the top position and the
physical sector No. in the bottom position, with the defect positions
listed in ascending order.
Sector numbers described in this format are physical sector numbers
which to not apply the "Track skew factor" and the "Cylinder skew
factor."
Table 4.39 Defect descriptor: physical sector address 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 Physical sector No. of defective block (MSB)
5 Physical sector No. of defective block
6 Physical sector No. of defective block
7 Physical sector No. of defective block (LSB)