Metalblock relinking to physical blocks of semiconductor memory in adaptive wear leveling based on health

摘要

Systems and methods for metablock relinking may be provided. A first physical block of a first metablock may be determined to have a different health than a second physical block of a second metablock based on health indicators of the first and second physical blocks. Each of the health indicators may indicate an extent to which a respective one of the first and second physical blocks may be written to and/or erased before the respective one of the first and second physical blocks becomes defective. The first physical block of the first metablock may be replaced with the second physical block of the second metablock based on a determination that the health of the first physical block of the first metablock is different than the health of the second physical block of the second metablock.

主权项

1. An apparatus for metablock relinking, the apparatus comprising a controller configured to:
determine a first metablock for relinking in response to a variance in health indicators of physical blocks of the first metablock exceeding a threshold level; determine that a first physical block of the first metablock comprises a different health than a second physical block of a second metablock based on health indicators, each of the health indicators indicates an extent to which a respective one of the first and the second physical blocks may be used before the respective one of the first and the second physical blocks becomes defective; and relink the first metablock through a replacement of the first physical block of the first metablock with the second physical block of the second metablock based on the determination that a health of the first physical block of the first metablock is different than the second physical block of the second metablock, each logical block of a block storage device is mappable to a corresponding metablock.