Abstract: The invention relates to an optical data system comprising an optical disc drive and a host. The optical disc drive is arranged to receive an optical disc and perform read and write actions with respect to the optical disc. The host is arranged to instruct the optical disc drive to perform a read or write action with respect to the optical disc. The optical disc drive may be arranged to a) the optical disc drive is arranged to perform a quality measurement generating a plurality of quality parameters, b) the optical disc drive is arranged to output the plurality of quality parameters to the host, and c) the host is arranged to decide on a further action based on the received plurality of quality parameters.

Abstract: An optical disk drive for scanning an optical disk having a wobbled groove and a land portion separating adjacent parts of the groove. The optical disk drive has a beam generator for generating a read beam and directing the read beam to the optical disk, a sensor for sensing a reflected beam produced by the optical disk upon receiving the read beam and for producing a sensor output signal with a sensor output signal amplitude, and an envelope analyzer to receive the sensor output signal from the sensor, to analyze an envelope (WS1e, WS2e) of the sensor output signal amplitude, and to derive from a variation of the envelope (WS1e, WS2e) as a function of time an indicator indicating whether the read beam is directed to the groove or to the land portion.

Abstract: An optical disk drive for scanning an optical disk having a wobbled groove and a land portion separating adjacent parts of the groove. The optical disk drive has a beam generator for generating a read beam and directing the read beam to the optical disk, a sensor for sensing a reflected beam produced by the optical disk upon receiving the read beam and for producing a sensor output signal with a sensor output signal amplitude, and an envelope analyzer to receive the sensor output signal from the sensor, to analyze an envelope (WS1e, WS2e) of the sensor output signal amplitude, and to derive from a variation of the envelope (WS1e, WS2e) as a function of time an indicator indicating whether the read beam is directed to the groove or to the land portion.