Optical information recording and reproducing system with overwrite capability and recording medium for use therewith
US6487151B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1995 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Dec 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2537
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording and reproducing method and apparatus for an optical disk of the phase transition type is provided. This method comprises the steps of deciding at random to invert or not to invert write data that has a predetermined block length; inverting the write data if the decision is to invert the write data; and recording either the non-inverted write data or the inverted write data into the photo-sensitive record layer. A synchronizing signal is recorded before the write data and/or dummy data after the write data in the way such that thermal stress is less likely to occur. A record end position can be determined precisely by detecting a stop pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.