Besides, in the light of practical experience, the paper summarized a series of measures for trouble-shooting of CD burners, and methods and directions for its recovery.

As application, the optical disk pre groove is measured by using fiber optical confocal scanning imaging system.

DVD disc recorder is a kind of recorder by disc as memory medium with high consistency and capacity, fulfilling the high fidelity of the picture and timbre and with the functions of program playing, forward playing, backward playing, repeat and skip playing, etc.