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Method for reducing magnetic storage volume for computer disk image backup

  • US 5,274,807 A
  • Filed: 11/01/1990
  • Issued: 12/28/1993
  • Est. Priority Date: 11/01/1990
  • Status: Expired due to Fees
First Claim
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1. A method of copying information stored on a first medium to a second medium, said information being stored on said first medium as a plurality of blocks, said method comprising the steps of:

  • determining ones of said plurality of blocks stored on said first medium that contain data,generating a data structure which records an indication of each of said determined ones of said plurality of blocks,reading said data structure to determine a first range of contiguous blocks as recorded in said data structure and copying to said second medium said first range of said plurality of blocks as recorded in said read data structure.

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