TRACKING METHOD AND TRACK FORMAT BASED ON QUADRATURE WOBBLE

摘要

The optical recording medium having as an optical disk, a plurality of adjacent tracks for storing digital optical information (N, N + 1, N + 2, N + 3, N + 4, N + 5) is provided. A track, for example, surrounding the center of the disc (1) extend in the tangential direction (T). Each track is, for example, as drops across the track pitch amount in the radial direction (R) to the outside from the center. Each of the plurality of tracks having a servo field containing a single tracking mark (TM) disposed on the track at a different location from the location of the track on four separate tangential A, B, C and D. And the one mark on one exists among these four locations for every four adjacent tracks on the medium. Position of the tracking mark (TM) is repeated in the same order for every four adjacent tracks. For any four such track, the track has a mark in the position A and B are separated by a single track, the track has a mark in the position C and D are separated by one track.