Fujitsu MAN3735MC Manual/User Guide - Page 50
Alternate block allocation by REASSIGN BLOCKS command
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(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. If there are unused spare sectors in the same cylinder as the specified defective logical data block, the alternate block is allocated to these unused spare sectors. However, the alternate block is allocated to unused spare sectors in the alternate cylinder when all spare sectors in the cylinder are used up. Figure 3.8 is examples of the alternate block allocation by the REASSIGN BLOCKS command. : n represents a logical data block number : Defective sector : Unused spare sector Figure 3.8 Alternate block allocation by REASSIGN BLOCKS command (3) Automatic alternate block allocation • Automatic alternate block allocation at read operation If the ARRE flag in the MODE SELECT parameter permits the automatic alternate block allocation, the IDD automatically executes the alternate block allocation and data duplication on the defective data block detected during the READ or READ EXTENDED command. This allocation method is the same as with the REASSIGN BLOCKS command (alternate sector treatment). 3 - 14 C141-E128-01EN
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