Information storage medium, information recording method, and information recording/reproduction apparatus

Abstract

This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.

1 . An information storage medium comprising: at least one pair of neighboring tracks formed on the information storage medium having a center of rotation, wherein
 one of said neighboring tracks is configured to record information of a combination of first group recording units and a first non-data portion which is located between the first group recording units,   an other of said neighboring tracks is configured to record information of a combination of second group recording units and a second non-data portion which is located between the second group recording units, and   an angular position of the first non-data portion with respect the center of rotation is different from an angular position of the second non-data portion with respect to the center of rotation.   
   
   
       2 . The medium of  claim 1 , wherein
 a recording start position determination mark is arranged prior to a position of one of the first and second non-data portions.   
   
   
       3 . A method of recording information on an information storage medium including at least one pair of neighboring tracks formed on the information storage medium having a center of rotation, wherein
 one of said neighboring tracks is configured to record information of a combination of first group recording units and a first non-data portion which is located between the first group recording units,   an other of said neighboring tracks is configured to record information of a combination of second group recording units and a second non-data portion which is located between the second group recording units, and   an angular position of the first non-data portion with respect the center of rotation is different from an angular position of the second non-data portion with respect to the center of rotation,   said method comprising:   generating data to be recorded; and   recording the generated data on recording tracks including the neighboring tracks.   
   
   
       4 . A method of reproducing information from an information storage medium including at least one pair of neighboring tracks formed on the information storage medium having a center of rotation, wherein
 one of said neighboring tracks is configured to record information of a combination of first group recording units and a first non-data portion which is located between the first group recording units,   an other of said neighboring tracks is configured to record information of a combination of second group recording units and a second non-data portion which is located between the second group recording units, and   an angular position of the first non-data portion with respect the center of rotation is different from an angular position of the second non-data portion with respect to the center of rotation,   said method comprising:   reading recorded information from one of the neighboring tracks; and   reading recorded information from the other of the neighboring tracks.