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Nonvolatile memory data recovery after power failure

  • US 9,478,271 B2
  • Filed: 04/01/2013
  • Issued: 10/25/2016
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A method for data recovery after a power failure, comprising the steps of:

  • determining whether a last power-down of a memory was an unsafe power-down, wherein the memory comprises a plurality of physical pages each having at least an upper page and a lower page;

    searching at least some of the plurality of physical pages to find a first erased lower page in response to the last power-down of the memory being determined unsafe;

    identifying an unsafe zone as two or more adjoining physical pages of the plurality of physical pages that include the first erased lower page and partially programmed data created by the unsafe power-down;

    identifying a pad zone as one or more of the plurality of physical pages located after the unsafe zone; and

    writing new data in the plurality of physical pages located after the pad zone, wherein the new data is written in a same block of the memory as the pad zone.

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