Fujitsu MBB2073RC User Manual download pdf (Page 41)

3.3 Defect Management

(1) Alternate block allocation during FORMAT UNIT command execution

When the FORMAT UNIT command is specified, the allocation of the alternate block to those

defective sectors included in the defect lists (P, G, or D) is continued until all spare sectors in the

same cell are used up. When they are used up, unused spare sectors in the alternate cylinder are

allocated to the defective sectors that follow the sector by means of alternate sector treatment. Figure

3.7 is examples of the alternate block allocation during the FORMAT UNIT command execution.

: n represents a logical data block number

: Defective sector

: Unused spare sector

Figure 3.7 Alternate block allocation by FORMAT UNIT command

During FORMAT UNIT command, alternate block allocation is conducted in following cases:

1) Unrecovered write offtrack condition during a media write

2) Uncorrectable Data Error during a media read (certification) *1

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Fujitsu MBB2073RC User Manual Page 41