Apparatus and method for distorted track data recovery by rewinding and re-reading the tape at a slower than nominal speed

  • US 5,349,481 A
  • Filed: 06/10/1993
  • Issued: 09/20/1994
  • Est. Priority Date: 06/10/1993
  • Status: Expired due to Term
First Claim
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1. Apparatus for reading information recorded on a storage medium in helical tracks, with each track comprising a plurality of blocks of data with each block having unique block-identifying information, said apparatus comprising:

  • a transport for selectively transporting the storage medium in forward and reverse directions of medium travel;

    a rotatable drum having a portion of a peripheral surface thereof contiguous with the storage medium as the storage medium is transported therepast by the transport;

    a reading head mounted on the drum for traversing original azimuthal paths across the storage medium and for reading blocks including the block-identifying information recorded along at least a portion of each of the original azimuthal paths;

    a controller which uses the block-identifying information to determine whether any read errors occurred during the traversal of the original azimuthal paths, and which requires that the read head re-read portions of the storage medium where the error occurred by traversing modified azimuthal paths, the modified azimuthal paths being separated from one another by a distance less than the track pitch.

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