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

  • US 10,061,696 B2
  • Filed: 05/27/2016
  • Issued: 08/28/2018
  • Est. Priority Date: 03/19/2014
  • Status: Active Grant
First Claim
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1. A method for managing garbage collection for an invisible band in a data storage device (DSD), the method comprising:

  • designating an invisible band that comprises a memory address range designed to indicate that logical data has been invalidated;

    creating one or more invisible band S-journals for TRIM operations, wherein the one or more invisible band S-journals contains mapping information transaction entries recording what logical data are mapped to a location designed for denoting that logical data has been invalidated;

    scheduling garbage collection for the one or more invisible band S-journals by alternating garbage collection on the one or more invisible band S-journals with garbage collection on one or more data band S-journals, wherein the one or more data band S-journals contain mapping information transaction entries indicating what logical data are written to memory locations in a selected physical region of the DSD; and

    performing the scheduled garbage collection.

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