Method and device for tracking and focusing enhancement of disk drives

A device for tracking and focusing enhancement of disk drives, the device being utilized for performing feedforward compensation for a first output signal generated by a feedback compensator of a disk drive, the first output signal being utilized for controlling a tracking position or a focusing position of a read/write (R/W) module of the disk drive, within the first output signal being a dominant signal, which is a periodic wave corresponding to a tracking error or a focusing error of the disk drive, the device comprising:

• a identification unit coupled to the feedback compensator for identifying a waveform of the dominant signal;
• a sinusoidal wave generator coupled to the identification unit for generating a correction signal according to the waveform of the dominant signal;
• and
• a superposing unit coupled to the feedback compensator and the sinusoidal wave generator for superposing the correction signal on the first output signal to correct the dominant signal.

A device for tracking and focusing enhancement of disk drives, the device being utilized for performing feedforward compensation for a first output signal generated by a feedback compensator of a disk drive, the first output signal being utilized for controlling a tracking position or a focusing position of a read/write (R/W) module of the disk drive, within the first output signal being a dominant signal, which is a periodic wave corresponding to a tracking error or a focusing error of the disk drive, the device comprising:

• a low pass filter (LPF) coupled to the feedback compensator for generating a low pass signal according to the first output signal;
• a memory coupled to the LPF for storing waveform information of the low pass signal;
• a first logic unit coupled to the memory for outputting a correction signal, wherein the correction signal corresponds to the waveform information stored in the memory;
• and
• a superposing unit coupled to the feedback compensator and the first logic unit for superposing the correction signal on the first output signal to correct the phase delay of the dominant signal.