Recording medium, recording method, reproduction method, recording apparatus and reproduction apparatus

A method for recording information on a recording medium having a recording area, the method comprising the steps of:

• generating and recording on the recording medium a first area including a fourth area, the fourth area including N number of frame areas, N being equal to or greater than 2;
• wherein:
• each of the N number of frame areas includes an area in which a synchronization code sequence and at least a portion of data are recorded,
• the synchronization code sequence which is recorded in the frame area located at the start of the fourth area is different from any synchronization code sequence which is recorded in any of the fame areas other than the frame area located at the start of the fourth area, and
• the synchronization code sequence which is recorded in the frame area located at the start of the fourth area is different by a code distance equal to or greater than 2 in the NRZI representation from any synchronization code sequence which is recorded in any of the frame areas other than the frame area located at the start of the fourth area.

A recording apparatus for recording information on a recording medium including a recording area, the recording apparatus comprising:

• a first generating unit which generates and records on the recording medium a first area including a fourth area, the fourth area including N number of frame areas, N being equal to or greater than 2;
• wherein:
• each of the N number of frame areas includes an area in which a synchronization code sequence and at least a portion of data are recorded,
• the synchronization code sequence which is recorded in the frame area located at the start of the fourth area is different from any synchronization code sequence which is recorded in any of the frame areas other than the frame area located at the start of the fourth area, and
• the synchronization code sequence which is recorded in the frame area located at the start of the fourth area is different by a code distance equal to or greater than 2 in the NRZI representation from any synchronization code sequence which is recorded in any of the frame areas other than the frame area located at the start of the fourth area.

A method for reproducing information recorded on a recording medium including a recording area,

• wherein:
• the recording area includes a first area,
• the first area includes a fourth area including N number of frame areas, N being equal to or greater than 2,
• each of the N number of the frame areas includes an area in which a synchronization code sequence and at least a portion of data have been recorded,
• the synchronization code sequence which has been recorded in the frame area located at the start of the fourth area is different from any synchronization code sequence which has been recorded in any of the frame areas other than the frame area located at the start of the fourth area, and
• the synchronization code sequence which has been recorded in the frame area located at the start of the fourth area is different by a code distance equal to or greater than 2 in the NRZI representation from any synchronization code sequence which has been recorded in any of the frame areas other than the frame area located at the start of the fourth area,
• the reproduction method comprising:
• reproducing the synchronization code sequence which has been recorded in the frame area located at the start of the fourth area;
• and
• reproducing at least the portion of the data.

A reproduction apparatus for reproducing information recorded on a recording medium including a recording area,

• wherein
• the recording area includes a first area,
• the first area includes a fourth area including N number of frame areas, N being equal to or greater than 2,
• each of the N number of frame areas includes an area in which a synchronization code sequence and at least a portion of data have been recorded,
• the synchronization code sequence which has been recorded in the frame area located at the start of the fourth area is different from any synchronization code sequence which has been recorded in any of the frame areas other than the frame area located at the start of the fourth area, and
• the synchronization code sequence which has been recorded in the frame area located at the start of the fourth area is different by a code distance equal to or greater than 2 in the NRZI representation from any synchronization code sequence which has been recorded in any of the frame areas other than the frame area located at the start of the fourth area,
• the reproduction apparatus comprising:
• a first reproduction unit which reproduces the synchronization code sequence which has been recorded in the frame area located at the start of the fourth area;
• and
• a second reproduction unit which reproduces at least the portion of the data.