Storage Media Inter-Track interference Cancellation

摘要

Described embodiments provide a method of cancelling inter-track interference (ITI) from one or more sectors read from a desired track of a storage medium. A read channel reads sectors in a desired track of the storage medium. A decoder of the read channel decodes the read sectors, and if the read sectors are incorrectly recovered from the storage medium, selected sectors of a first adjacent track and a second adjacent track are read. An ITI canceller of the read channel estimates ITI in the read sectors of the desired track corresponding to the selected sectors of each adjacent track and subtracts the estimated ITI of each adjacent track from the data for the sectors of the desired track, providing updated sector data. The ITI cancelled data is replayed to the decoder, Which decodes the ITT cancelled data and provides the decoded ITI cancelled data as output of the read channel.

主权项

1. A storage media controller for cancelling inter-track interference (ITI) in one or more sectors read from a desired track of a storage medium, the media controller comprising:
a read channel configured to read one or more sectors in a desired track of the storage medium; an iterative decoder circuit operable to apply a data decoding algorithm to one or more read sectors derived from a desired track of the storage medium to yield a decoded output; if the decoded output fails to converge:
the read channel is configured to read selected sectors of a first adjacent track and a second adjacent track;an ITI canceller of the read channel configured to (i) estimate ITI in the one or more read sectors of the desired track corresponding to the selected sectors of the first adjacent track and the second adjacent track, (ii) subtract the estimated ITI of the first adjacent track and the second adjacent track from the data for the one or more sectors of the desired track to provide updated sector data, and (iii) replay the ITI cancelled data to the iterative decoder;the iterative decoder circuit is configured to (i) decode the ITI cancelled data and (ii) provide the decoded ITI cancelled data as output data of the read channel;otherwise, if the decoded output converges, the iterative decoder of the read channel is configured to provide the decoded one or more read sectors as output data of the read channel.