beautypg.com

FUJITSU MAV2036RC User Manual

Page 40

background image

Data Format

3-12

C141-E219

If above errors are detected during FORMAT UNIT command, the HDD allocates the alternate
block(s) to the defective data blocks. Reassign procedure itself is the same as one in REASSIGN
BLOCKS command.

*1 Certification is permitted when DCRT flag is cleared (DCRT flag=0) in FORMAT UNIT

command.
The HDD 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. The
alternate block is allocated to unused spare sectors in the alternate cylinder.

Figure 3.8 is examples of the alternate block allocation by the REASSIGN BLOCKS command.

: Unused spare sector

Example Reassign: Block 16

: Defective sector

: n represents a logical data block number

Figure 3.8 Alternate block allocation by REASSIGN BLOCKS command

This manual is related to the following products: