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Information recording/reproducing apparatus with variable rate of revolution and data clock frequency

  • US 5,959,954 A
  • Filed: 03/29/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 08/08/1995
  • Status: Expired due to Fees
First Claim
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1. A data processing apparatus, comprising:

  • optical disc holding means for holding an optical disc which records and reproduces data, the optical disc having first, second, third, and fourth regions of data;

    revolution control means for executing revolution control of the optical disc at one of the first, second, third and fourth rates of revolution for each corresponding first, second, third and fourth regions;

    the first region being formatted according to an M-CAV system so that said optical disc is rotated at a first rate of revolution when reading/writing data in the first region, and having a first plurality of zones, each zone of said first plurality of zones having its own clock frequency so that a recording density remains constant,the second region being located adjacent to the first region and being formatted according to an M-CAV system so that said optical disc is rotated at a second rate of revolution that is different from the first rate of revolution when reading/writing data in the second region, and having a second plurality of zones, each zone of said second plurality of zones having its own clock frequency so that a recording density remains constant,the third region being located adjacent to the second region and being formatted according to an M-CAV system so that said optical disc is rotated at a third rate of revolution that is different from the first and second rates of revolution when reading/writing data in the third region, and having a third plurality of zones, each zone of said third plurality of zones having its own clock frequency so that a recording density remains constant, andthe fourth region being located adjacent to the third region and being a region formatted according to an M-CAV system so that said optical disc is rotated at a fourth rate of revolution that is different from the first, second, and third rates of revolution when reading/writing data in the fourth region, and having a fourth plurality of zones, each zone of said fourth plurality of zones having its own clock frequency so that a recording density remains constant, andreproducing means for reproducing information stored in each of the zones in each of the first, second, third and fourth regions in accordance with the clock frequency of the corresponding zone.

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