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3.3 Defect Management
C141-E198 3-13
*1 Certification is permitted when DCRT flag is cleared (DCRT flag=0) in FORMAT UNIT
command.
The IDD checks all initialized logical data blocks by reading them out after the above alternate
block allocation is made to initialize (format) the disk.
(2) Alternate block allocation by REASSIGN BLOCKS command
When the REASSIGN BLOCKS command is specified, the alternate block is allocated to the
defective logical data block specified by the initiator by means of alternate sector treatment. If there
are unused spare sectors in the same cell as the specified defective logical data block, the alternate
block is allocated to these unused spare sectors. However, the alternate block is allocated to unused
spare sectors in the alternate cylinder when all spare sectors in the cell are used up.
Figure 3.8 is examples of the alternate block allocation by the REASSIGN BLOCKS command.
Alternate sectors
The same cell
Figure 3.8 Alternate block allocation by REASSIGN BLOCKS command
: Unused spare sector
: Defective sector
: n represents a logical data block number