Patent ID: 7009918

Claim:
An information storage apparatus that generates a tracking error signal based on a detection signal from a detector unit, and performs a control operation based on the tracking error signal, said apparatus comprising: a plurality of tracking error signal generating units that generate tracking error signals by different processes based on the detection signal; and a selection unit that selects a tracking error signal corresponding to an operation mode from the tracking error signals generated by the plurality of tracking error signal generating units, wherein the plurality of tracking error signal generating units include: a first tracking error signal generating unit that amplifies a peak value of the detection signal to generate a tracking error signal; and a second tracking error signal generating unit that amplifies the detection signal to generate a tracking error signal, wherein the selection unit selects the tracking error signal generated by the first tracking error signal generating unit when the operation mode is a seek operation mode, and selects the tracking error signal generated by the second tracking error signal generating unit when the operation mode is a tracking operation mode.