Patent ID: 6032276
Filing Date: 2000-02-29
Classification: G11B

Abstract:
An apparatus for reading data from a disk type recording media, said apparatus having the capability of reducing the revolution speed at which the disk type recording media is rotated to read defective data, the apparatus comprising:disk rotating means;pick up means for reading the data from the disk and for outputting a signal corresponding to the read data;signal processor means connected to said pick up means for processing the signal output from the pick up means and outputting a processed signal containing position data corresponding to positions having defective data; andcontroller means connected to said signal processor means and to said disk rotating means for recording each position of the disk having defective data and for iteratively transmitting at least one signal to the disk rotating means to reduce the revolution speed at which the disk is rotated and determining if the defective data can be read until an error correcting revolution speed is obtained, said controller means recording the error correcting revolution speed in relation to the recorded position of the defective data, and later controlling said disk rotating means to read the defective data at the recorded error correcting revolution speed.