Interleaved redundancy sector for correcting an unrecoverable se

Details Interleaved redundancy sector for correcting an unrecoverable se Interleaved redundancy sector for correcting an unrecoverable se

1996-09-16

1998-05-12

Baker, Stephen M.

Excavating

371 404, 371 4014, G11B 2018

Patent

active

057517339

ABSTRACT:
A disc drive storage system is disclosed that employs sector level and track level error correction systems (ECS), wherein the track level error correction capability is increased by interleaving the track level redundancy. In the preferred embodiment, each sector on the disc is divided into three interleaves or codewords with sector level redundancy generated for each interleaved codeword. The track level redundancy is then generated by combining the interleaved codewords separately according to a predetermined error correction operation (e.g., byte XOR) to form an interleaved redundancy sector. During readback, the sector level ECS generates an erasure pointer corresponding to an uncorrectable codeword within a sector for use by the track level ECS. In this manner, the track level ECS can correct up to three uncorrectable sectors when three sectors contain a single uncorrectable codeword in separate interleaves.

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