Radial separation distance determination for a data storage medium
US7590039B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2005 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Dec 20, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00594
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for determining a separation distance between radial locations on a data storage medium, such as an optical disc. A first number of channel bits are detected at a first radial location of the medium, and a second number of channel bits are detected at a second radial location. The radial separation distance therebetween is determined in relation to the respective first and second numbers. Preferably, the first radial location is a first track on the medium, and the second radial location is a second track on the medium. Preferably, a motor rotates the medium, a data transducer transduces readback signals from the first and second locations, and a processor determines the respective numbers of bits from the readback signals. The radial separation distance is preferably used to authenticate the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.