Abstract: A data reading unit reads analog data stored on a recording medium and converts the analog data to a digital signal synchronously with a clock signal. A waveform equalizer shapes the digital signal using a coefficient. The waveform equalizer also optimizes the coefficient synchronously with the clock signal using an intensity parameter. The waveform equalizer includes a control unit for setting an initial value of the intensity parameter and dynamically adjusting the intensity parameter. The data reader also includes a PLL circuit for generating the clock signal. The PLL circuit may generate the clock signal using a second intensity parameter. The PLL circuit includes a control unit for dynamically altering the second intensity parameter.

Abstract: A device for reproducing data recorded on a recording medium, such as a magnetic disk or an optical disk, includes a data reading apparatus and a data reproducing apparatus. The data reading apparatus reads sector data from the reading medium, including data, synch-byte signals and control signals, and generates a clock signal. The data reading apparatus reproduces the recorded data in accordance with the clock signal. When a synch-byte signal is detected by the reading apparatus, transmission of control signals to the reproducing apparatus is inhibited. In addition, lost data is recovered using other data and an ECC code.