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Wednesday, July 05, 2000
Sony Establishes Double Density CD-ROM/-R/-RW Formats


"...Sony today announced plans to develop a "Double Density CD-ROM/-R/-RW (tentative name)" with 1.3GB data capacity. The Double Density CD formats are designed to provide a natural migration path for both consumers and manufacturers alike, as the new formats offer a low-cost solution to high capacity discs that inherit the basic specifications of the CD formats. This allows manufacturers to utilize their current CD technologies and production facilities to manufacture Double Density CDs.

Double Density CD formats' high capacity is realized by a few simple modifications to the CD formats. To increase data density, track-pitch and minimum pit length are miniaturized to increase the data capacity from 650MB to 1.3GB. To accommodate higher physical bit density, a parameter in the error-correction scheme (CIRC) has been changed, and the address format (ATIP) has been expanded. A copy control scheme will be included in the format to meet the increasing demands for secure content protection. The remaining areas inherit the basic specifications of the conventional CD formats to make use of the existing CD infrastructure.

Royal Philips Electronics and Sony will license the Double Density CD formats together. Philips will serve as the licensing contact (see website http://www.licensing.philips.com/). The formats are being finalized for licensing by September 2000. As for compliant media, verification services are planned in the near future..."



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