Mechanism of HD-BURN record
Secrets of CD-R/RW burning in double-density.
The methods generally used to achieve high-density are as follows:
  1. Shorten the minimum pit length.
  2. Reduce the track pitch.
  3. Expand the writing area on the disc.
  4. Improve efficiency of modulation method.
  5. Improve efficiency of error correction method.

HD-BURN is designed with the methods of 1,4, and 5 in consideration of using existing CD-R/RW disc and using CD for playback optical system and mechanism.

Among the methods above, it seems to be able to make the minimum pit length much shorter, however, it is shortened to the level in which the minimum pit observation level will not become too small and the read/write system configuration is made easy when replaying by normal replay-ONLY- pickup.

Besides, the error correction method has no problem with correction capability for the extensive improvement of its performance even though the correction codes are less than those of CD.

< Table 1 >
Item CD HD-BURN HD-BURN improvement ratio (twice)
Minimum pit length

0.83μm

 0.62μm 1.343
Track area 1.6±0.1 1.6±0.1 1.0
Record area 25mm in radius 25mm in radius 1.0
Error correction method CIRC RS-Product Code 1.40
Storage capacity 700MB(Type80) 1400MB(Type80) 2.0
| Feature | Structure | Product | HD-BURN center | Logotype | FAQ |
Go to Home Page
Copyright(C) 1999-2005 SANYO Electric Co., Ltd. All rights reserved.