Data recording medium and recording/reproducing apparatus for providing optimum position of mark start and end parts

A recording and reproducing apparatus for recording and reproducing 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, the 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 the first pulse movement (TF) and the 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;
• and
• a code indicating a method for using the first pulse movement (TF) and the last pulse movement (TL) either as a pulse shift amount or as a pulse width amount;
• said apparatus comprising:
• device operable to reproduce the first pulse movement (TF) and the code, which are prerecorded to the data recording medium;
• device operable to store the reproduced first pulse movement (TF) and the code;
• device operable to generate a drive pulse based on a data recording signal, and correct the generated drive pulse based on the first pulse movement (TF) and the last pulse movement (TL), the code selecting the use of the first pulse movement (TF) and the last pulse movement (TL) either as a pulse shift amount or as a pulse width amount;
• device operable to emit an optical beam based on the corrected drive pulses to form spaces and marks on the data recording medium.

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;

• characterized by a control information recording area storing:
• 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, without changing the pulse width, 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.