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Physical Format of Hard Disks
CYLINDER, HEAD, AND SECTOR ADDRESSES
Each track consists of ID sections (cylinder, head, and sector addressing fields)
followed by data areas, in the following format.
ID
SECTION
Sector Address
Head Address
Cylinder Address
In the ID section of a bad track, the cylinder, head, and sector addresses are all FFH.
A track with an ID section not equal to FFH but with its most significant bit set to 1
is defined as a permanent bad track. A permanent bad track is a bad track which has
already been detected upon the shipment from the factory and has been identified by
the manufacturer by setting on the LSB in the head address in the ID section. (The
shipment of a hard disk having a bad track is permissible where the number of bad
tracks detected is less than the number specified by the manufacturer.)
J-3
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