Method of reading data off a rotating recording medium
US5384759A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Aug 9, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/65
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of reading recorded-data on a spiral data track of a rotating recording medium which is scanned by a radially moveable scanning device. The scanning device follows the spiral data track and appears to shift from one track to another. The directory data are divided into a plurality of directory data blocks and stored on the spiral data track. Each of the data blocks represents a different characteristic of the recorded-data and at least n+1 identical blocks for each characteristic are sequentially arranged on the spiral data track, n being a whole number. The directory data are read by moving the scanning device from one data block to another. The motion between data blocks occurs either along the same track, inwardly from one track to another, or outwardly from one track to another and therefore the scanning of all n+1 blocks for every characteristic is not necessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.