Multiple clock tracks for erasable and rewriteable optical disks
US6046969A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Mar 17, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for generating a write clock for writing data along servo tracks of an erasable/rewriteable optical disk utilize clock patterns that correspond on a one-to-one basis to designated data zones on an optical disk. The clock patterns are located in one or more clock tracks and are dedicated to providing reference clock information. In one embodiment, an optical disk is divided radially into constant angular velocity (CAV) data zones and corresponding circular clock tracks are located near the outer edge of the disk. The circular clock tracks correspond on a one-to-one basis to the CAV data zones, and the unique clock patterns within the clock tracks are utilized to generate write clock signals. Clock information is read by a dedicated reference clock transducer and data is written to and read from a servo track of an optical disk by a read/write transducer. An optical disk drive equipped with the reference clock transducer and the read/write transducer also contains a clock circuit that receives reference clock signals and generates write clock signals. While generating write clock signals when data is written across CAV data zones, a first clock pattern is read to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.