Patent ID: 6172961
Filing Date: 2001-01-09
Classification: G11B

Abstract:
An information recording/reproducing optical disk comprising:a plurality of land sectors arranged along a first spiral track, each land sector comprising a first recording portion which is an area having a land shape in which information is recorded/reproduced, and a first-half header portion arranged before the first recording portion, for indicating information on an address of the information to be recorded/reproduced on/from the first recording portion; anda plurality of groove sectors arranged along a second spiral track, each groove sector comprising a second recording portion which is an area having a groove shape in which information is recorded/reproduced, and a second-half header portion arranged before the second recording portion, for indicating information on an address of the information to be-recorded/reproduced on/from the second recording portion,the second-half header portion and the first-half header portion making a pair to be arranged in a staggered pattern,the plurality of groove sectors being arranged along a second spiral track in succession to the plurality of land sectors;wherein the land sectors are arranged along the first spiral track in succession to the plurality of groove sectors arranged along the second spiral track, thereby performing the switch between the land sector and the groove sector alternately and successively every spiral track,at the first-half header portion of the land sector arranged at the position for the switch to the groove sector among the plurality of land sectors arranged along the first spiral track, location information indicating a sector located immediately before a sector at which tracking polarity is switched is recorded together with the address information, andat the second-half header portion of the groove sector arranged at the position for the switch to the land sector among the plurality of groove sectors arranged along the second spiral track, said location information is recorded together with the address information.