A data storage medium having a pattern representing data bits arranged in a plurality of interlocked triangularly shaped tracks. The medium may be a prerecorded optical storage material having a set of optically contrasting marks arranged in the tracks. The track width increases from a start point to...http://www.google.com.tw/patents/US5047619?utm_source=gb-gplus-share專利 US5047619 - High density data track layout for storage media
