Patent ID: 7799181
Filing Date: 2010-09-21
Classification: G11B

Abstract:
1. A method of manufacturing an optical storage medium, comprising: forming a first protective layer on a transparent substrate having guide grooves through sputtering; forming a recording layer on the first protective layer through sputtering, wherein the recording layer has a thickness in a range between 13 nm and 17 nm; forming a second protective layer on the recording layer through sputtering; and subsequently, recording data blocks in said recording layer indicative of first and fourth pulse widths, such that data is recorded in the medium by using a multi-pulse waveform of a light source driving power, a linear velocity of rotation of the medium being set substantially in a speed range higher than 5 m/s and up to 28 m/s, wherein the multi-pulse waveform represents a sequence of mark and space portions included in the light source driving power according to a modulated data signal, and wherein the multi-pulse waveform is set such that each mark portion has a pulse width corresponding to a multiple of a period T of a given write clock, the multi-pulse waveform including a front-end portion fp, a multi-pulse portion mp and a tail-end portion op, the front-end portion having said first pulse width with a high-power level Pw and starting from a middle-power level Pe, the multi-pulse portion including a sequence of write pulses each having a second pulse width with the high-power level Pw and a third pulse width with a low-power base level Pb, and the tail-end portion having said fourth pulse width with the base level Pb and ending at the middle-power level Pe, and wherein the optical storage medium is configured such that said first pulse width of the front-end portion ranges from 0.1 T to 1 T and said fourth pulse width of the tail-end portion ranges from 0.2 T to 1.3 T, and the recording layer of said optical recording medium is capable of recording data to meet the requirements: −15≦asymmetry≦5, and contain information related to the multi-pulse waveform.