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Power fail latching based on monitoring multiple power supply voltages in a storage device

  • US 9,280,429 B2
  • Filed: 12/19/2013
  • Issued: 03/08/2016
  • Est. Priority Date: 11/27/2013
  • Status: Active Grant
First Claim
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1. A method of protecting data in a storage device, the method comprising:

  • determining whether a first power supply voltage for the storage device provided to the storage device is out of range for a first time period;

    determining whether a second power supply voltage for the storage device provided to the storage device is out of range for a second time period; and

    in accordance with a determination that at least one of the first power supply voltage is out of range for the first time period and the second power supply voltage is out of range for the second time period, latching a power fail condition, and in accordance with the power fail condition, performing a power fail operation, the power fail operation including;

    transferring data held in volatile memory in the storage device to non-volatile memory in the storage device; and

    removing power from a plurality of controllers of the storage device.

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