Patent ID: 7602573
Filing Date: 2009-10-13
Classification: G11B

Abstract:
1. A data storage device comprising: a data storage medium; a magnetic head which reads a pattern from the data storage medium and generates a corresponding analog read signal; a pre-amplifier which amplifies the analog read signal output from the magnetic head and outputs a corresponding amplified analog read signal; an analog-to-digital converter which converts the analog read signal output by the pre-amplifier into a digital signal; a discrete Fourier transformer which executes a discrete Fourier transformation of the digital signal output from the analog-to-digital converter and outputs a corresponding discrete Fourier transformed signal; a temperature sensor, which is separate from the magnetic head, and which senses an internal temperature of the data storage device and outputs a temperature signal denoting the internal temperature of the data storage device; a processor which receives the discrete Fourier transformed signal and the temperature signal, and which generates a first control signal based on the discrete Fourier transformed signal and the temperature signal; and a control circuit which is responsive to the first control signal to output a second control signal to the magnetic head which adjusts a distance between the magnetic head and the data storage medium.