Various data storage formats help to efficiently locate, read, and write user data stored on magnetic tape media. A tape is formatted by writing multiple segment-headers, free from any interleaved access of user data. Adjacent segment-headers are spaced by a predetermined interval to define multiple...http://www.google.com.tw/patents/US5757571?utm_source=gb-gplus-share專利 US5757571 - Flexible-capacity scaling for efficient access of ordered data stored on magnetic tape media 
