| 摘要 |
A record carrier (1) is described which has a servo track (4) indicating an information track (9) intended for recording information blocks The servo track (4) has a periodic variation of a physical parameter at a predetermined frequency, usually called wobble, the servo track has modulated parts for encoding position information according to a predetermined type of modulation The record earner comprises a management area in which the servo track comprises permanent data. The permanent data is encoded using a different type of modulation, but using the variations of the same physical parameter Direct digital modulation (41) is proposed for the different type of modulation Further a device for reading and/or writing the record earner is described. |
