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System and method for filtering write operations to a storage medium containing an operating system image

  • US 20030221083A1
  • Filed: 05/21/2002
  • Published: 11/27/2003
  • Est. Priority Date: 05/21/2002
  • Status: Active Grant
First Claim
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1. A computer-readable medium having computer-executable instructions for performing steps by a write filter in an operating system running in a computing device, the computer having a main storage medium having stored thereon an operating system image, the steps comprising:

  • intercepting a write request from the operating system to write data into the main storage medium at a specified location;

    writing the data of the write request and data representing the specified location into an auxiliary storage medium, the auxiliary storage medium being non-volatile;

    receiving a checkpoint request to watermark data stored on the auxiliary storage medium;

    creating a checkpoint for watermarking data stored in the auxiliary storage medium as of a time of the checkpoint for preventing the data stored of the time of the checkpoint from being written over.

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