Ranked cleaning policy and error recovery method for file systems using flash memory

Abstract

The present invention relates to a cleaning policy and a method for recovering error in a file system using flash memory; and, more particularly, to a ranked cleaning policy in a file system using flash memory which can be used effectively and longer by dividing it into segments, adopting the ranked cleaning policy and arranging cleaned spaces evenly, and to an error recovery method in a file system using flash memory which can recover error by subdividing cleaning status when sudden power error is caused, as well as to a computer-based recording medium for recording a program to embody the methods above. A method for ranked cleaning policy in file systems using flash memory, the method comprising the steps of: calculating rank values for all segments of the flash memory periodically; and if the storable space of the flash memory becomes less than a predetermined volume, a cleaner operating to clean invalid space of segments in order of their rank values obtained in the previous step high to low and thus to secure new storage space.

Dependencies are inferred from the claim text.