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Physical sector address format defect descriptor
Figure 4.21 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.
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
0
1
2
3
4
5
6
7
Figure 4.21 Defect descriptor: physical sector address format
IMPORTANT
7
6
5
Cylinder No. (MSB)
Cylinder No.
Cylinder No. (LSB)
Head No.
Physical sector No. of defective block (MSB)
Physical sector No. of defective block
Physical sector No. of defective block
Physical sector No. of defective block (LSB)
C141-E054-02EN
4
3
2
1
0
4 - 99
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