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System and method for automatically saving memory contents of a data processing device on power failure

  • US 20060072369A1
  • Filed: 10/12/2004
  • Published: 04/06/2006
  • Est. Priority Date: 10/04/2004
  • Status: Active Grant
First Claim
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1. A method of automatically saving data upon interruption of power from a primary power supply in a data processing device having a non-volatile memory device for storing data and retaining the stored data when the primary power supply is deactivated and a volatile memory device for caching data from the non-volatile memory device for reading or processing by a processor when the primary power supply is activated, comprising the steps of:

  • a. designating modified sectors of data stored in the volatile memory device as modified and storing a modified sector directory list, b. detecting a power interruption in the primary power supply, c. enabling a secondary power supply, and d. writing data from the volatile memory device and the modified data directory list to the non-volatile memory device while the secondary power supply is enabled.

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