| 摘要 |
PROBLEM TO BE SOLVED: To more reinforce a data protective effect at the time of a data recording by recording data on tracks different each other every recording data unit after a recording density is enhanced by forming tracks of both sides sharing a physical wobble in which address information are encoded in helical form. SOLUTION: Tracks Tr.A and B of lands Ld sharing a wobbled groove WG in which physical addresses between non-wobbled grooves NWG are encoded are formed in helical form on a disk. Respective recordings and reprodutions are performed by allowing a main beam spot SP and side beam spots SPs1 and s2 to respectively trace the track Tr.A, grooves NWG and WG. The track picth of tracks Tr.A and B is made to be 0.95μm and a certain recording data unit and a recording data unit being on a sequence positioning next to the recording unit are recorded on tracks different each other. Thus, a recording density becomes high and a data recording having high reliability is easily performed.
|
