Patent Number: 7,088,653

Title: Information recording method

Abstract: A recording method for an optical medium including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the substrate, each of the tracks being divided into a plurality of units, each of the units including a dropout portion of the groove structure which is a non-groove portion along the track in a circumferential direction of the track, the groove structure being wobbled in a fixed cycle in a radial direction which continues in the circumferential direction along the track. When the wobble is formed in the circumferential direction of the track, the dropout portion is formed so that a phase of the wobble is continued with a phase of the wobble of the groove structure within another unit adjacent to the dropout portion. The method includes providing the optical medium, and recording information by irradiating an optical spot on the medium.

Inventors: Miyamoto; Harukazu (Kodaira, JP), Suzuki; Yoshio (Fujisawa, JP), Suzuki; Motoyuki (Yokohama, JP), Sugiyama; Hisataka (Kodaira, JP), Minemura; Hiroyuki (Yokohama, JP), Fushimi; Tetsuya (Chigasaki, JP), Tokushuku; Nobuhiro (Yokohama, JP)

Assignee: Hitachi, Ltd.

International Classification: G11B 7/00 (20060101); G11B 7/24 (20060101)

Expiration Date: 8/08/02018