METHOD AND DEVICE FOR DETECTING SERVO ERROR, DISC, SUPPORTING QUALITY OF SERVO ERROR SIGNAL, METHOD FOR ADJUSTMENT OF DISCS PLAY/RECORD DEVICE SERVO, METHOD FOR DETECTING ERROR OF ORDER AND METHOD FOR DETECTING SLANT ERROR

摘要

FIELD: optical record/play devices. ^ SUBSTANCE: data area on disc is divided into sectors. Each sector header has first header and second header, recorded in a way to deflect from track middle in opposite directions. Said first and second headers have address areas, wherein sectors address signals and synchronous signals areas are recorded, wherein synchronous signals for detecting address signals are recorded. First value of synchronous clock signal is detected from first header and is a Lvfo1. second value of synchronous clock signal is detected from second header and is a Lvfo3. relation of first value Lvfo1 to second value Lvfo3 is a previously set limited value. ^ EFFECT: higher precision of error detection. ^ 7 cl, 15 dwg