Method for improving readability of an optical disc, and associated optical storage apparatus

An optical storage apparatus, comprising:

• a read channel arranged to read information from an optical disc, the read channel comprising a waveform equalizer, a slicer, a phase locked loop (PLL), and a demodulating and decoding module;
• a servo control module arranged to perform servo control for the optical storage apparatus;
• and
• a parameter tuning enhancement (PTE) device arranged to change a first control parameter of the optical storage apparatus that accesses the optical disc and obtain a plurality of associated values of an index corresponding to readability of the optical disc for respective changed/unchanged values of the first control parameter, wherein the PTE device is further arranged to set the first control parameter to be an optimal value out of the changed/unchanged values of the first control parameter according to the associated values of the index, the PTE device changes a second control parameters of the optical storage apparatus with the first control parameter set to be the optimal value and obtains a plurality of associated values of the index for respective changed/unchanged values of the second control parameters, and the PTE device is further arranged to set the second control parameter to be an optimal value out of the changed/unchanged value of the second control parameter according to the associated values of the index that are obtained for the respective changed/unchanged values of the second control parameter;
• wherein the first and the second control parameters are utilized for controlling at least a portion of the waveform equalizer, the slicer, the PLL, the demodulating and decoding module, and the servo control module.