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Abstract

In the beginning of a reproducing operation of information data from a first layer of a disk in an optical disk recording and/or reproducing apparatus, an optimizing operation of a servo control for an optical pick-up through which the information data are reproduced from the first layer is initially performed. Thereafter, the information data read from the first layer are temporarily stored in a DRAM at a first data rate, and the information data are read out from the DRAM to an external apparatus at a second data rate lower than the first data rate. Therefore, a volume of the information data in the DRAM increases in the reproducing operation. When the volume of the information data reaches an upper limit of the DRAM, the optical pick-up is set to a standby condition to stop the reading of the information data from the first layer, and optimizing operations for another or other layers of the disk are performed. During the reproducing operation, when a physical condition of the apparatus or the disk changes in the degree of requiring the optimization of the servo control, the optimizing operations are performed on condition that the optical pick-up is set to the standby condition. Accordingly, the optimizing operations can be performed without interrupting the reproducing operation.

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