A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of servo grooves on at least one of said sides of said media that have...http://www.google.de/patents/US5535069?utm_source=gb-gplus-sharePatent US5535069 - Very high-density diskette format method and computer-implemented process
