Command - Fujitsu MBA3147RC - Enterprise 147 GB Hard Drive Product Manual

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

command.

The HDDs check 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.
Figure 3.8
38
Example Reassign: Block 16
: n represents a logical data block number
: Defective sector
: Unused spare sector
Alternate block allocation by REASSIGN BLOCKS command
C141-E252