Error detection/correction and fault detection/recovery – Pulse or data error handling – Error/fault detection technique
Reexamination Certificate
2011-03-01
2011-03-01
Alphonse, Fritz (Department: 2112)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Error/fault detection technique
C714S760000, C714S797000, C714S776000
Reexamination Certificate
active
07900125
ABSTRACT:
One or more techniques provide majority detection in error recovery. Accordingly, a device retries reading an ECC codeword having one or more bits for a plurality of retries, and stores each retry. The device (“hard” majority detection) votes on a value of each bit of the codeword based on a majority of corresponding retry values in the plurality of corresponding retries. Also, the device (“soft” majority detection) may determine reliability information for a value of each bit of the codeword based on a reoccurrence ratio of corresponding retry values in the plurality of retries. The device may declare erasures based on the reliability information and a (dynamically adjusted) threshold of uncertainty, e.g., where an “uncertain” bit based on the threshold or any symbol with an “uncertain” bit is declared as an erasure.
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Liu Jingfeng
Rub Bernardo
Zheng Pei-hui
Alphonse Fritz
Magee Theodore M.
Seagate Technology LLC
Westman Champlin & Kelly P.A.
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