Flash memory controller: Difference between revisions

Revision as of 12:15, 18 June 2023

Revision as of 01:56, 25 July 2023

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{{Main|Wear leveling}}

Flash memory can withstand a limited number of program-erase cycles. If a particular flash memory block were programmed and erased repeatedly without writing to any other blocks, the one block would wear out before all the other blocks thereby prematurely ending the life of the storage device. For this reason flash controllers use a technique called [[wear leveling]] to distribute writes as evenly as possible across all the flash blocks in the SSD. In a perfect scenario this would enable every block to be written to its maximum life so they all fail at the same time.<ref name="Li-Pin Chang">{{cite citeseerxCiteSeerX |citeseerx = 10.1.1.103.4903 |title=On Efficient Wear Leveling for Large Scale Flash Memory Storage Systems |author=Chang, Li-Pin |date=2007-03-11}}</ref>

==Flash translation layer (FTL) and mapping==