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Wear-Leveling function

Wear leveling is a process that is designed to extend the life of solid state storage devices. SSDs are store date in blocks. Each block can tolerate a finite number of program/erase cycles before becoming unreliable. For example, MLC NAND flash is typically rated at about 3,000 program/erase cycles. Wear leveling arranges data so that write/erase cycles are distributed evenly among all of the blocks in the device.

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