Figure 3.7 Alternate Block Allocation By Format Unit Command - Fujitsu MAN3367FC - Enterprise 36.7 GB Hard Drive Product/Maintenance Manual

: n represents a logical data block number
: Defective sector
: Unused spare sector
Figure 3.7
If the data block verifying operation (certification) is not permitted (DCRT flag = 0) in the 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. If a defective data block is
detected during the check, the IDD allocates the alternate block to the defective data block. This
alternate block allocation is made by means of alternate sector treatment only like processing by the
REASSIGN BLOCKS command even if unused spare sectors exists in the same cylinder.
C141-E133-02EN
Alternate block allocation by FORMAT UNIT command
3.3 Defect Management
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