Automated wear leveling in non-volatile storage systems

  • US 7,120,729 B2
  • Filed: 10/14/2003
  • Issued: 10/10/2006
  • Est. Priority Date: 10/28/2002
  • Status: Active Grant
First Claim
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1. In a memory system including a plurality of units of erasable and re-programmable non-volatile memory cells having contiguous physical addresses organized into zones with address boundaries therebetween and wherein a distinct range of logical addresses are mapped into each of the zones, a method of operation that comprises:

  • reassigning the boundary addresses to delete at least one unit from each of the zones and to add said at least one unit to an adjacent zone without changing the number of units in the individual zones,thereafter accessing the zones for programming data to or reading data from the reassigned memory cell units therein according to logical addresses of the data, andrepetitively reassigning the boundary addresses and accessing the zones at least until the plurality of memory cell units have all been moved from their zones to adjacent zones, thereby to spread out usage of the units accessed through the logical addresses.

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