Cyclic video recording method for an optical storage medium

A cyclic video recording method for an optical storage, the optical storage using an optical pickup head to produce spots which form an optical trace on an optical disk for recording information to be stored in multiple data tracks of the optical disk, the optical disk being divided into multiple sub-zones which are grouped into a set of forward seeking sub-zones SB[1], SB[3], SB[5] . . . SB[NF] and a set of backward seeking sub-zones SB[2], SB[4], SB[6] . . . SB[NB], wherein NF=N−1 and NB=N when N is an even number or NF=N and NB=N−1 when N is an odd number, and the set of forward seeking sub-zones and the set of backward seeking sub-zones are distributed interleavingly, the optical storage for cyclic video recording comprising the steps of:

• (A) setting an initial value of current sub-zone and an initial value of flag and performing a write operation, wherein the flag indicates a direction to seek the sub-zones and the initial value of the flag is determined by the initial value of the current sub-zone;
• (B) determining whether the flag indicates a forward direction, and further determining whether the current sub-zone is the last sub-zone SB[NF] in the set of forward seeking sub-zones when the flag indicates the forward direction;
• (C) setting a next sub-zone in the set of forward seeking sub-zones to become the current sub-zone and performing the write operation when the current sub-zone is not the last sub-zone SB[NF] in the set of forward seeking sub-zones, and returning to repeat step (B);
• (D) setting the flag to a backward direction, setting the last sub-zone SB[NB] in the set of backward seeking sub-zones to become the current sub-zone and performing the write operation when the current sub-zone is the last sub-zone SB[NF] in the set of forward seeking sub-zones, and returning to repeat step (B);
• (E) determining whether the current sub-zone is not the lowest sub-zone SB[2] in the set of backward seeking sub-zones when step (B) determines that the flag does not indicate the forward direction;
• and
• (F) setting a previous sub-zone in the set of backward seeking sub-zones to become the current sub-zone and performing the write operation when the current sub-zone is not the lowest sub-zone SB[2] in the set of backward seeking sub-zones, and returning to repeat step (B).