Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications page 292

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 cell does not exceed the number of spare sectors per cell, the logical data blocks are
relocated by sector slip processing so that their physical connectivity is maintained.
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