| 摘要 |
PURPOSE:To prevent an overflowing and the shorten an access time while securing a user area capacity by making a part of the low order into an (n) pieces of pointers for selecting data alternating areas among addresses for a user unit area in a disk. CONSTITUTION:For a recording signal, an error correcting code, etc., are added by a correcting circuit 6, the signal is supplied through a modulating/ demodulating circuit 5 to a pick-up 3 ad the signal is recorded to a disk 1 with a laser beam. The disk 1 is classified into a user area and an alternating area, and at respective areas, a track as the unit area of recording and reproducing is formed by a plural sectors. Respective sectors are composed of the ID area and a data area. The alternating area is classified into an (n) pieces of areas, a comparative low-order bit among the track address of a user area is used as a pointer to select either of the (n) pieces of the alternating areas. As a result, the alternating area is effectively used, and the capacity of the user area is enlarged only by the part.
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