Recording method

A recording method comprising the steps of:

• modulating data to be recorded, to generate a plurality of recording modulation codes;
• and
• emitting a pulsed light beam to a data storage medium, so that a plurality of recording marks and spaces are recorded on the data storage medium, the lengths of the recording marks and spaces being defined by the modulated data, wherein
• at least two of the plurality of the recording marks comprise:
• a first pulse which is disposed at a front and forms a leading edge of the recording mark;
• a last pulse which is disposed at a backend and forms a trailing edge of the recording mark;
• and
• a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark,
• the multi-pulse train has a pulse period longer than T, T representing a reference period of the recording modulation code,
• the number of pulses in each of the recording marks is increased by one as the recording mark is increased in length by 2T,
• the plurality of recording marks have different lengths differing by T or multiples thereof from one another,
• the shortest recording mark and the second shortest recording mark are constituted by a single pulse, and
• among the recording marks each constituted by two or more pulses, a pulse width of the first pulse of any recording mark that has a predetermined length is equal to a pulse width of the first pulse of any recording mark that has a length which is 2T longer than the predetermined length.

A data storage medium comprising a recording area on which a plurality of recording marks and spaces having lengths defined by a predetermined modulation method are formed by emitting a pulsed light beam to the data storage medium, wherein

• at least two of the plurality of the recording marks comprise:
• a first pulse which is disposed at a front and forms a leading edge of the recording mark;
• a last pulse which is disposed at a backend and forms a trailing edge of the recording mark;
• and
• a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark,
• the multi-pulse train has a pulse period longer than T, T representing a reference period of the recording modulation code,
• the number of pulses in each of the recording marks is increased by one as the recording mark is increased in length by 2T,
• the plurality of recording marks have different lengths differing by T or multiples thereof from one another,
• the shortest recording mark and the second shortest recording mark are constituted by a single pulse, and
• among the recording marks each constituted by two or more pulses, a pulse width of the first pulse of any recording mark that has a predetermined length is equal to a pulse width of the first pulse of any recording mark that has a length which is 2T longer than the predetermined length.