Patent ID: 6985414
Filing Date: 2006-01-10
Classification: G11B

Abstract:
1. A method of simultaneously writing data to a plurality of tracks of an optical disk, the method comprising: providing a plurality of writing laser beams; modulating the writing laser beams according to the data to be written to the corresponding tracks of the optical disk; and providing an optical system for directing the laser beams to the corresponding tracks of the optical disk, wherein the plurality of laser beams illuminate spots on the optical disk that are spaced apart by a distance sufficient to prevent thermal interference between data marks being written by nearby beams of the plurality of writing laser beams, wherein the plurality of spots are aligned linearly at an angle to the tangent of the data tracks of the optical disk, and wherein the angle between the line of spots and the tangent is determined by wherein α is the angle, p is the track pitch of the optical disk, d is the minimum distance between writing spots, and k is the difference in track numbers between the tracks being written.