Method and apparatus for error management in a solid state disk

Details Method and apparatus for error management in a solid state disk Method and apparatus for error management in a solid state disk

1995-12-22

1999-02-23

Gossage, Glenn

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711103, 39518204, G06F 1216, G06F 1108

Patent

active

058754776

ABSTRACT:
A method of accessing a memory includes the step of partitioning the memory into a plurality of partitions. A primary logical identifier is stored in the memory to identify each partition. A redundant secondary logical identifier is also stored in the memory to identify each partition. In response to a requested partition number identifying a partition to access, at least one partition of data is located using a first stored logical identifier formed from a portion of each of the primary and secondary logical identifiers. The at least one partition of data is then identified using a second stored logical identifier formed from a portion of at least one of the primary and secondary logical identifiers. In one embodiment, a first error detection code (EDC) stored in the header is used to validate the partition data. If an error is detected, the validity of the partition data is tested using an EDC computed by ANDing the first EDC and a second EDC stored in the header. During a clean-up operation, a header is selected from a block targeted for clean-up. The first and second stored logical identifiers in the selected header are compared with each other. If there is not a match, then validation is performed using the ANDed value of the first and second stored logical sector number. In one embodiment, the memory is a flash electrically erasable programmable read only memory. In one embodiment, the partitions are sectors and the identifiers are sector numbers.

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