| 摘要 |
A block correlation table includes block addresses of unusable block portions in an irreversibly writeable memory and includes addresses of associated substitute block portions in the irreversibly writeable memory. A request for data stored at a logical address is received from a host processor. A physical address in the irreversibly writeable memory is calculated from the logical address using a fixed mathematical relation. The physical address is compared with the block addresses in the block correlation table. When the physical address does not match any of the block addresses in the table, the irreversibly writeable memory is referenced to read data stored at the physical address, and when the physical address matches one of the block addresses in the table, the irreversibly writeable memory is referenced to read data stored at the address of its associated substitute block portion. The read data is transmitted to the host processor.
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