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Partial garbage collection for fast error handling and optimized garbage collection for the invisible band

  • US 9,354,955 B1
  • Filed: 04/10/2014
  • Issued: 05/31/2016
  • Est. Priority Date: 03/19/2014
  • Status: Active Grant
First Claim
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1. A method for managing garbage collection of memory locations in a data storage device (DSD) comprising a plurality of dies, each die comprising a plurality of memory blocks, the method comprising:

  • selecting a physical region of memory to be garbage collected, the selected physical region being a subset of a block management region; and

    garbage collecting the selected physical region of memory, the garbage collecting comprising;

    determining one or more journals corresponding to the selected physical region, the one or more journals comprising transaction entries indicating what logical data are written to memory locations in the selected physical region;

    determining whether the memory locations within the physical region of memory contain valid data based on a comparison of information in the one or more journals and a mapping table;

    if valid data exists, copying valid data into memory locations in memory regions other than the selected physical region of memory; and

    alternating garbage collecting on an invisible band journal with garbage collecting the selected physical region of memory associated with one or more data band journals, wherein garbage collecting on the invisible band journal comprises mapping information transaction entries recording what logical data are mapped to a location designed for denoting that logical data has been invalidated,wherein the selected physical region of memory is erased when the block management region is erased.

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