Patent ID: 10067866

Abstract:
A solid-state disk including first and second memories and a wear leveling module. The second memory has a lower write cycle lifetime than the first memory. The wear leveling module: receives logical addresses (LAs) from a host; determines write frequencies respectively for the LAs, where the write frequencies indicate how frequently data is written to the LAs; determines write frequency rankings (WFRs) based on respectively the write frequencies, where each of the WFRs is based on a weighted time-decay average of write counts or an average of elapsed times of write cycles for the corresponding one of the LAs; and for each LA mapped to the first memory, if a corresponding one of the WFRs is greater than a lowest one of the WFRs of (i) the first memory, or (ii) the first and second memories, remaps the LA with the lowest WFR to a different physical address.