Data access method for improving performance of an optical...

Data erasure preventing method and circuit thereof and...

Data reading device having servo controlled position reset

Data record formatting system and reading/writing system for opt

Data reproduction arrangement for recalling data readable with a

Data reproduction control method for optical disk drive and...

Data storage system and method for operating a servo system

Data-track search apparatus for locating a desired data track on

Defect detecting circuit and reproducing apparatus having the de

Defect detecting method

Defect detection apparatus for detecting defects on a recording

Defocus detection device, defocus detection method and...

Defocus detection device, defocus detection method and...

Defocus error signal detection apparatus having phase...

Demodulation circuit for demodulating wobbling signal

Demodulation circuit for demodulating wobbling signal

Demodulation of tracking error signal to obtain lens...

Deriving a tracking error signal from a time difference between

Detecting anomalies in a scanning signal

Detecting apparatus for detecting a tracking error signal in an