Patent ID: 6504800
Filing Date: 2003-01-07
Classification: G11B

Abstract:
An optical disk on/from which data can be recorded/reproduced in units of ECC blocks each constituted by a plurality of sectors, comprising:a plurality of land tracks and groove tracks which are alternately arranged in a radial direction of the optical disk; a land portion which is formed on a corresponding groove track of the groove tracks to separate the corresponding groove track of the groove tracks and is substantially flush with the land tracks; a set of embossed pits which is formed in units of ECC blocks in a boundary between the land portion and one of the land tracks located on two sides of the groove track in which the land portion is formed; and a land record/reproduction interruption portion which is formed in a land data area adjacent to the land portion, the land data area belonging to the other of the land tracks located on the two sides of the groove track and opposing to the set of embossed pits, no data being recorded/reproduced on/from the land record/reproduction interruption portion.