Holographic recording medium

Abstract

This invention is a holographic recording medium including a track in which position information to specify a recording position and a reproducing position of page data is formed. The position information of the track is formed of position detection patterns. The position detection patterns each including a first detection mark row including center pits arranged at predetermined intervals; and a second detection mark row including side marks arranged at the same intervals as the intervals of the center pits, the side marks having lengths substantially corresponding to integral multiples of the intervals of the center pits. The second detection mark row is arranged adjacent to the first detection mark row such that both ends of the side marks are arranged so as to correspond to the center pits in a track width direction, and page data is recorded and reproduced on the basis of positions of the center pits or positions of the ends of the side marks.

1 . A holographic recording medium comprising:
 a track in which position information to specify a recording position and a reproducing position of page data is formed, wherein   the position information of one track includes a plurality of rows of position detection patterns,   the plurality of rows of position detection patterns include a first detection mark row including center marks arranged at predetermined intervals, and a second detection mark row in which side marks each including a plurality of pits are arranged at predetermined intervals,   the side mark is arranged in the vicinity of the first detection mark in a track width direction, and arrangement of the pits which constitute the side mark is different in each side mark and corresponds to a specific physical address, and   page data is recorded and reproduced on the basis of positions of the center marks.   
   
   
       2 . A holographic recording medium comprising:
 a track in which position information to specify a recording position and a reproducing position of page data is formed, wherein   position detection patterns which constitute the position information of the track include a plurality of guide pitches arranged at regular intervals and a computer-generated hologram pattern formed between the guide pitches every predetermined number of guide pitches,   the computer-generated hologram pattern is an indented pattern in which information to specify a physical address of its position is previously recorded, and   page data is recorded and reproduced on the basis of the position of each of the guide pitches.