Patent ID: 6212142
Filing Date: 2001-04-03
Classification: G11B

Abstract:
A data recording medium having a plurality of tracks for recording information represented as marks and spaces between the marks in a data recording area of the data recording medium, the marks being formed by an optical beam modulated by one or a plurality of drive pulses where a number of the drive pulses is determined according to a length of a mark part in the input signal to be recorded on the track, said data recording medium comprising:a control information recording area storing:a first pulse movement (TF) for modifying a first pulse of the drive pulses, and a last pulse movement (TL) for modifying a last pulse of the drive pulses, wherein said first pulse movement (TF) and said last pulse movement (TL) indicate either a pulse shift amount for shifting the first and last pulses, respectively, without changing the pulse width, or a pulse width amount for changing the pulse width of the first and last pulses, respectively; anda code indicating a method for using said first pulse movement (TF) and said last pulse movement (TL) either as a pulse shift amount or as a pulse width amount.