Scalable repair block error correction for sequential multiple data blocks in a magnetic data storage device

摘要

A technique for recovering of “squeezed” sectors in a set of sequential sectors such as are used in Shingled Magnetic Recording (SMR) is described. Embodiments of the invention use a programmable erased sector recovery scheme, which is a concatenation of a “Cauchy-type” track erasure correction code, together with a media-error correction code that generates N-weighted parity-sectors per track and is capable of replacing up to N-erased sectors per track in any possible combination.

主权项

1. A data storage device that stores data in tracks that include a plurality of sectors of data, the data storage device comprising:
a media erasure detection encoder/decoder (MEDC) that receives data comprising a set of sectors to be written sequentially on a selected track and generates error correction code (ECC) check symbols for each sector of the data; and a track-erasure encoder/decoder (TED) that receives the data and the ECC check symbols for each sector of the data generated by the MEDC and generates one or more cumulatively weighted parity-sectors per track to be recorded on the selected track, the cumulatively weighted parity-sectors being generated sequentially from the data and ECC check symbols for each sector for the selected track.