Abstract: An approach is provided for improving write performance using a buffer cache based on a buffer replacement policy. A buffer cache manager is configured to improve address mapping scheme associated with write performance between an application system and a storage device system. The manager selects a victim page to be evicted from a victim block of a buffer cache according to a recently-evicted-first rule. And the victim block is selected associated with a log block of a memory.

Abstract: Disclosed is a memory system including a storage device such a hard disk or flash memory, and an access method. The memory system includes: a storage device storing metadata; a file system generating and managing abstract data associated with the metadata; and a cache memory temporarily storing the abstract data. The file system accesses the metadata of the storage device with reference to the abstract data stored in the cache memory.

Abstract: Provided is a method of hiding a specified directory with no effect on compatibility with an existing file system. According to an aspect of the invention, an apparatus for managing a hidden area includes a hidden area generation unit which sets a portion of the data area as a hidden area and records meta data for the set hidden area, a hidden area release unit which moves a directory entry of a root directory of the hidden area into the directory entry area and returns a cluster recorded with the meta data to release the set hidden area, and an access control unit which controls an access to the hidden area when the hidden area is set.

Abstract: Disclosed are an apparatus and a method for storing and managing additional data in a file system. The apparatus comprises a search unit to search for an unused region in a directory entry, a storage unit to store additional data in the unused region, and an additional data managing unit to locate the position of the additional data using the signature and checksum of the additional data. The method includes (a) searching for an unused region of a directory entry, (b) storing additional data in the unused region, and (c) locating the position of the additional data using the signature and checksum of the additional data. According to the present invention, additional data can be stored, used and managed utilizing unused regions of a directory entry without degrading the compatibility of the file system, and enhancing the performance of the FAT file system.