| 摘要 |
A disk of the present invention includes
a first storage area (2) for reproducing data, and
a second storage area (3) for recording and reproducing data, the second storage area comprising a plurality of zones of tracks of sectors, the number of sectors per track of the second storage area being constant in a zone, and increasing from a radially inner zone of the second storage area to a radially outer zone thereof.
The first storage area comprises a backup data portion (51) and a user data portion (52), wherein:
the backup data portion (51) comprises tracks of equal numbers of sectors, corresponding sectors in each track being radially aligned; and
the user data portion (52) comprises a plurality of zones of tracks of sectors, the number of sectors per track of the user data portion being constant in a zone, and increasing from a radially inner zone of the user data portion to a radially outer zone thereof. |
