Methods and apparatus for correcting data and error...

Details Methods and apparatus for correcting data and error... Methods and apparatus for correcting data and error...

2007-03-13

2007-03-13

Chase, Shelly (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

Reexamination Certificate

active

10452603

ABSTRACT:
When data is read from a disk and stored in volatile memory, check bits are generated and stored in the memory using an algorithm such as cyclical redundancy check (CRC). The CRC algorithm operates on the basis of the bit length in which the data is organized, such as 8 bits. If the data has errors, an error correction code (ECC) algorithm is used to correct the data errors, but the ECC algorithm operates on the basis of symbols having a different bit length, such as 10 bits. To avoid having to re-read the data from the volatile memory to adjust the CRC value, the CRC algorithm is executed on selected mask data developed by the ECC algorithm, the CRC algorithm being executed on the basis of the second bit length to generate a CRC mask. The CRC mask corrects the stored CRC value.

REFERENCES:
patent: 5459742 (1995-10-01), Cassidy et al.
patent: 5691994 (1997-11-01), Acosta et al.
patent: 5696775 (1997-12-01), Nemazie et al.
patent: 6048090 (2000-04-01), Zook

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