Patent ID: 6349081
Filing Date: 2002-02-19
Classification: G11B

Abstract:
A data recording medium having a plurality of concentric or spiral tracks for recording information represented as marks and spaces between the marks, the marks being formed by emitting to a track recording surface an optical beam modulated by a plurality of drive pulses where the drive pulse count is adjusted according to a length of a mark part in the original signal to be recorded to the track, said data recording medium comprising:a control data zone for storing control data formed by pits, said control data comprising: at least one of a first pulse movement (TF) for modifying a first pulse of said drive pulses, and a last pulse movement (TL) for modifying a last pulse of said drive pulses, wherein said first pulse movement (TF) and last pulse movement (TL) indicate either a pulse shift amount for shifting said first and last pulses, respectively, or a pulse width amount for changing the pulse width of said first and last pulses, respectively, and, a code indicating a method for using said first pulse movement (TF) and last pulse movement (TL) either as a pulse shift amount or as a pulse width amount; and a data recording area for recording data, said data recording area comprising a drive test zone used by a recording device when the data recording medium is tested by the recording device.