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Incrementally restoring a mass storage device to a prior state

  • US 6,871,271 B2
  • Filed: 12/20/2001
  • Issued: 03/22/2005
  • Est. Priority Date: 12/21/2000
  • Status: Expired due to Term
First Claim
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1. In a computer system that includes a mass storage device that stores a plurality of data blocks, a method of updating the data blocks while enabling a previous state of the mass storage device to be accessible, comprising the acts of:

  • receiving a write request that is to overwrite an existing data block in the mass storage device with a new data block;

    prior to executing the write request, storing a copy of the existing data block in a preservation memory associated with the computer system, wherein the preservation memory includes a sequence of data blocks that have been overwritten in the mass storage device, the sequence of data blocks enabling corrupted data on the mass storage device to be incrementally restored in reverse chronological order;

    associating a time stamp with the copy of the data block in the preservation memory; and

    executing the write request, such that the existing data block stored in the mass storage device is overwritten with the new data block.

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