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C141-E124-01EN3 - 94
x Physical sector address format defect descriptor
Figure 3.15 shows 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.
Note:
Sector numbers described in this format are physical sector numbers which to not
apply the “Track skew factor” and the “Cylinder skew factor.”
Also, in order to specify an entire track as defective, X ‘FFFFFFFF’ must be
specified as the defective block physical sector No.
Bit
Byte
76543210
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)
Figure 3.15 Defect descriptor: physical sector address format