BUFFER-AWARE GARBAGE COLLECTION TECHNIQUE FOR NAND FLASH MEMORY-BASED STORAGE SYSTEMS

摘要

PURPOSE: A garbage collection technique considering buffer is provided to reduce additional reading and writing occurred during garbage collection. CONSTITUTION: In case a storage device based on NAND flash memory is used and a buffer cache(600) exists within a host system or a storage unit, FTL(Flash Translation Layer) performs a garbage collection referring to data in the buffer cache. The replacement object log block is selected in the garbage collection in consideration of the content of the buffer cache. The garbage collection operates in the block merge in consideration of the buffer content.