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2.9 Data Block Addressing
A spare sector area (replacement area) is assured in the user space for replacement
of defective sectors. The user can (using the MODE SELECT or MODE SELECT
EXTENDED command), allocate several sectors in the final track of each
cylinder and several cylinders (replacement cylinders) inside the user space
(replacement cylinders) as the replacement area.
For defective sectors on the disk medium, through HDD internal defect
management, data blocks for replacement are assigned in defective sector units.
Through this defect management, the INIT can regard all the logical data blocks
in the user space as error free and can access them.
For details concerning the data format on the disk medium (cylinder
configuration, track format and sector format) as well as details on defect
management methods and replacement block assignment methods, see Chapter 3,
"Data Format" in the "Product Manual". Also, see Chapter 7, "Disk Media
Management", for an outline of defect management methods.
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