Storage device, head position detection method and control circuit
AssigneeFujitsu Limited
InventorTatsuhiko Kosugi
Life of this patent
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Abstract
According to one embodiment, a storage device includes an area demodulator and a head position demodulator. The area demodulator demodulates a first demodulation signal and a second demodulation signal having a phase difference of 90° from a read signal by a head of an area demodulation pattern recorded on a medium. The head position demodulator receives the first demodulation signal and the second demodulation signal, and outputs a phase angle indicating a direction of a vector formed in a phase plane by the first demodulation signal and the second demodulation signal as a head position signal.
Claims20
A storage device, comprising:
- an area demodulator configured to demodulate a first demodulation signal and a second demodulation signal having a phase difference of 90° from a read signal by a head of an area demodulation pattern recorded on a medium;
- and
- a head position demodulator configured to receive the first demodulation signal and the second demodulation signal, and output a phase angle indicating a direction of a vector formed in a phase plane by the first demodulation signal and the second demodulation signal as a head position signal.
A head position detection method, comprising:
- an area demodulator demodulating a first demodulation signal and a second demodulation signal having a phase difference of 90° from a read signal by a head of an area demodulation pattern recorded on a medium;
- and
- a head position demodulator receiving the first demodulation signal and the second demodulation signal, and outputting a phase angle indicating a direction of a vector formed in a phase plane by the first demodulation signal and the second demodulation signal as a head position signal.
A control circuit, comprising:
- an area demodulator configured to demodulate a first demodulation signal and a second demodulation signal having a phase difference of 90° from a read signal by a head of an area demodulation pattern recorded on a medium;
- and
- a head position demodulator configured to receive the first demodulation signal and the second demodulation signal, and output a phase angle indicating a direction of a vector formed in a phase plane by the first demodulation signal and the second demodulation signal as a head position signal.
Dependencies are inferred from the claim text.