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C141-E205 3-11
The alternate block allocation is executed by the FORMAT UNIT command, the REASSIGN
BLOCKS command, or the automatic alternate block allocation. Refer to Chapter 3 “Command
Specification” and Subsection 5.3.2 “Auto alternate block allocation processing” in the SCSI
Logical Interface Specifications for details of specifications on these commands. The logical data
block is allocated to the next physically continued sectors after the above sector slip treatment is
made. On the other hand, the logical data block is allocated to spare sectors which are not
physically consecutive to the adjacent logical data blocks. If a command which processes several
logical data blocks is specified, the IDD processes those blocks in ascending order of logical data
block.
(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 specified 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 subsequent sectors in the cylinder by means of alternate sector treatment.
Figure 3.7 is examples of the alternate block allocation during the FORMAT UNIT command
execution.