When a write processing portion in the disk driver receives a plurality of write requests from an application program, the write processing portion divides the data designated by the request into the data block unit, adds the control block including the reverse index showing a position on the original...http://www.google.com.tw/patents/US6721863?utm_source=gb-gplus-share專利 US6721863 - Disk control mechanism preferable for random disk write
