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2.3 Defect Management
2.3.1 Defect management schematic diagram
Defective sectors on the disk shall be replaced by good sectors according to the defect
management scheme as follows: Defective sectors found during surface certification are handled
by a sector slipping algorithm. Defective sectors found after initialization are handled by a linear
replacement algorithm.
Figure 2.2 shows the algorithms for alternate processing.
(a) Sector slipping algorithm
(b) Linear replacement algorithm
Figure 2.2 Algorithms for alternate processing
The user area is divided into several groups during media initialization. Each group contains data
sectors and spare sectors. Spare sectors are used as replacements for defective data sectors. Media
initialization can include a certification of the user area.
Figure 2.3 shows an example of alternate processing.