Fujitsu MAP3147NC/NP Manual de usuario descargar pdf (Pagina 46)

3-12 C141-E166

The alternate block allocation is executed by the FORMAT UNIT command, the REASSIGN

BLOCKS command, or the automatic alternate block allocation. Refer to OEM Manual–SCSI

Logical 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.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 129 130

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Fujitsu MAP3147NC/NP Manual de usuario Pagina 46