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Sorted serpentine mapping for storage drives

  • US 9,213,493 B1
  • Filed: 12/16/2011
  • Issued: 12/15/2015
  • Est. Priority Date: 12/16/2011
  • Status: Expired due to Fees
First Claim
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1. A storage drive system comprising:

  • a plurality of disk platters aligned along a central axis, each disk platter comprising a plurality of disk surfaces, each disk surface comprising a plurality of tracks configured to store data;

    a plurality of physical heads associated with the plurality of disk surfaces, each physical head configured to access the plurality of tracks of the corresponding disk surface, wherein at least some physical heads in the plurality of physical heads have different data rates; and

    a controller configured to;

    associate a plurality of logical heads with the plurality of physical heads, each physical head associated with a different disk surface;

    sort the plurality of logical heads by respective data rates of the associated physical heads;

    designate as a first logical head the logical head associated with a physical head having a highest data rate in the plurality of physical heads; and

    map the plurality of tracks according to a serpentine mapping pattern, said serpentine mapping pattern based on the association of the plurality of physical heads with the plurality of logical heads so that a first logical address of a plurality of logical addresses used by a host system to access data stored in the storage drive system is mapped to an outermost track of a disk surface associated with the first logical head,wherein the controller is further configured to map as a first starting track of the serpentine mapping pattern the outermost track of the disk surface associated with the first logical head, andwherein mapping the plurality of tracks according to the serpentine mapping pattern results in improved performance as compared to grouping the plurality of tracks into a plurality of zones sorted in accordance with the respective data rates of the plurality of physical heads.

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