Method and apparatus to protect data within a disk drive buffer

Details Method and apparatus to protect data within a disk drive buffer Method and apparatus to protect data within a disk drive buffer

1995-06-30

2000-01-11

Elmore, Reba I.

Excavating

371 375, 371 391, H03H 1300

Patent

active

060128399

ABSTRACT:
An architecture that utilizes the cross-check code associated with the error correction code in a data communications system as a data integrity code to protect data stored in a temporary storage buffer within a data channel. In a preferred embodiment, a cross-check encoder and comparison circuit is added to an interface circuit which receives data from a host processing system. Incoming host data is encoded to produce redundant information according to the same Reed-Solomon code implemented in the cross-check circuitry already provided in the data path to detect miscorrections by the error correction code. Cross-check redundancy generated by the interface cross-check encoder is appended to its associated data block in the block memory buffer. The integrity of the data blocks passing through the buffer is checked by utilizing the cross-check circuitry to regenerate the redundant cross-check bytes and then performing a comparison of the regenerated cross-check bytes with the cross-check bytes from the buffer. A similar process is repeated in the reverse path when the data blocks are recovered from a storage medium and delivered to the host through a path that includes the buffer.

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