Double Density
CD Format
Sony Establishes Double Density CD-ROM/-R/-RW Formats
----- Conventional CD technologies utilized to realize 1.3GB
capacity -----
(Tokyo, Japan, July 5, 2000) Sony Corporation 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.
The recent evolution of high performance processors and high
capacity hard disk drives has empowered the PC to handle large audio, video
and still image files. That in turn has raised the need for higher capacity
CDs to store and share those files with other devices at the lowest running
cost. In light of this market demand, Sony decided to develop the Double Density
CD formats.
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.
Basic Specifications of Double Density CD-ROM/-R/-RW formats
|
Double Density CD
|
Conventional CD
|
|
Data Capacity
|
1.3GB (2048B/sector)
|
CD-ROM (Mode1)/-R/-RW:
650MB (2048B/sector)
|
|
Wavelength
|
780nm
|
|
Objective Lens
|
Playback: NA=0.50
Record/Playback: NA=0.55
|
Playback: NA=0.45
Record/Playback: NA=0.50
|
|
Disk Size
|
Diameter: 120mm
Thickness: 1.2mm
|
|
Track Pitch
|
1.1 um
|
1.6 um
|
|
Minimum Pit Length
|
0.623 um
|
0.833 um
|
|
Scanning Velocity
(multiplies according to drive speed)
|
0.90 m/s
|
1.2 - 1.4 m/s
|
|
Error Correction
|
CIRC7
|
CIRC
|
|
Modulation
|
EFM
|
