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3.3 Format Commands
C141-E167
3 - 81
Note:
In order to specify an entire track as defective, X ‘FFFFFFFF’ must be specified as the
byte distance from the index to the defect position.
Bit
Byte
76543210
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)
Figure 3.14 Defect descriptor: Byte distance from index format
• 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.