Recording and playback system for digital disc systems - has write protected servo information recorded on track sections to provide accurate positioning of heads

摘要

The digital information recording or playback system, using discs, has a number of heads that are moved radially by a drive system coupled to a controller. The data is recorded onto tracks and the head positions are aligned (SL1) using write protected servo information occupying a particular track section (SI). A data section (NI) is followed by a zero phase section (PLO), a synchronising field section and two angled sections (A, B). These sections provide data for the controller to adjust the head alignment. ADVANTAGE - Rapid positioning of heads over tracks. Better A-D conversion accuracy. Reduced load on processor.