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Method for mapping around defective sectors in a disc drive

  • US 4,924,331 A
  • Filed: 05/23/1988
  • Issued: 05/08/1990
  • Est. Priority Date: 11/20/1985
  • Status: Expired due to Term
First Claim
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1. In a microprocessor controlled disc drive including at least one constantly rotating disc having a plurality of concentric tracks where data is written and read, and means for positioning a transducer relative to a specified track on said disc for reading and writing data thereon, said positioning means being responsive to user-initiated commands to position said transducer head on user-accessible tracks on said disc and read or write data, the improvement comprising means for storing multiple copies of controlling operating data relative to said user-initiated commands on non-user accessible tracks of said disc, means for accessing said controlling operating data and for modifying said user-initiated commands in accordance with said controlling operating data for controlling said seek to position said transducer over a selected track.

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