Patent ID: 7355936
Filing Date: 2008-04-08
Classification: G11B

Abstract:
1. A disc drive apparatus for recording data into or reproducing data from a disc recording medium comprising: a data area, which first data is configured to be recorded into and reproduced from by adoption of a rewritable or write-once recording technique, and which second data remains recorded into and reproduced from by adoption of a groove-wobbling technique; and a reproduction-only area only allowing third data recorded therein by adoption of a groove technique to be reproduced, wherein: said first data is configured to be recorded by adoption of a first modulation technique, including a first error-correction block structure; said second data is recorded by adoption of a second modulation technique; and said third data is recorded by adoption of a third modulation technique, including a second error-correction block structure based on a first correction coding for said first error-correction block structure, said disc drive apparatus including: head means for radiating a laser beam to a track created as a groove on said disc recording medium and receiving a reflected beam signal; extraction means for extracting a signal representing a shape of said track from said reflected beam signal; first data-signal extraction means for extracting a signal representing said first data from said reflected beam signal; second data demodulation means for demodulating, in a reproduction operation carried out on said data area, said signal representing said shape of said track by said second modulation technique; first data demodulation means for demodulating said signal representing said first data in a reproduction operation carried out on said data area by said first modulation technique; third data demodulation means for demodulating, in a reproduction operation carried out on reproduction-only area, said signal representing said shape of said track by said third modulation technique; error correction means for carrying out error-correction processing based on error-correction codes on a modulation result output by said first data demodulation means and a modulation result output by said third data demodulation means; and control means for driving said second data demodulation means to carry out demodulation processing in a data operation performed on said data area, requesting said error correction means to carry out error-correction processing based on said first error correction block in said recording or reproduction operation performed on said data area, driving said third data demodulation means to carry out demodulation processing in a reproduction operation performed on said reproduction-only area, requesting said error correction means to carry out error-correction processing based on said second error correction block in said reproduction operation performed on said reproduction-only area.