Fujitsu MAP3147 Scsi Logical Interface Specifications page 268

Disk Media Management
The alternate block allocation history (defect position information) is registered as an addition to the
defect list (G List). Therefore, when reinitializing the hard disk with the FORMAT UNIT command
(see Section 6.2.2), if use of the G List is specified, defect processing can be performed which
reflects the operation results up to that time. Also, since "Alternate sector processing" is applied in
alternate block allocation in the REASSIGN BLOCKS command, the physical connectivity of the
logical data block positions on the disk media is destroyed, but by reinitializing the disk, as long as
the number of defective sectors in the cylinder does not exceed the number of spare sectors per
cylinder, the logical data blocks are relocated by sector slip processing so that their physical
connectivity is maintained.
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