Data storage device extending erasures for LDPC-type decoding
US10417089B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2018 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | May 27, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/6325
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A data storage device is disclosed comprising a non-volatile storage medium (NVSM). A reliability metric for each symbol of each of a plurality of codewords read from the NVSM is generated, and a number of erasures for a first codeword are generated, wherein the number of erasures exceeds the correction power of the first codeword. A reliability metric of the first codeword is modified corresponding to one of the erasures. The reliability metrics for each codeword including the modified reliability metrics of the first codeword are first iteratively processed using a low density parity check (LDPC) type decoder, thereby first updating the reliability metric for each symbol of each codeword. The reliability metrics for the first codeword are second updated using the parity sector, and the second updated reliability metrics for the first codeword are second iteratively processed using the LDPC-type decoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.