Patent ID: 7929825

Claim:
A data processor that is able to store audio data representing audio on an optical disk, the optical disk including a first area made up of a first group of unit areas, video data representing video being stored in the first area, the data processor comprising: an audio buffer memory for retaining the audio data; a writing control section for reserving a second area made up of a second group of unit areas and instructing to store the audio data in the second area; and a head for reading and writing the data from/on one of the unit areas after another in accordance with the instruction, wherein the writing control section finds the data length of each said unit area of the second group and reserves the second area, in which a data length of the unit area of the second group is equal to or more than a quantity of the audio data to be played back over fourth and fifth periods of time, the fourth period of time being n+2 times (where n is an integer equal to or greater than two) as long as the amount of time it takes to move the head, the fifth period of time being taken to read the video data from the number n of unit areas of the first group.