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US 10,276,198 B1Granted
Method and apparatus for multi-channel servo demodulation
AssigneeMarvell International Ltd.
InventorsSupaket Katchmart, David Sue-Hong Liaw, Li Zhang
Life of this patent
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Abstract
This disclosure describes apparatuses and techniques for multi-channel servo demodulation. Multiple servo demodulation channels enable additional information to be obtained during the self-servo writing process, such as relative positions of multiple read heads and tracking of multiple servo patterns. This additional information enhances accuracy for self-servo writing and can lead to higher recording densities in media drives, and thus more storage with little or no additional cost.
Claims20
An apparatus comprising:
- a media disk having multiple servo patterns including a spiral seed servo pattern and a spiral product servo pattern;
- a first read element configured to:
- read the multiple servo patterns from the media disk;
- and
- generate multiple waveforms, the multiple waveforms including a first waveform associated with the spiral seed servo pattern and a second waveform associated with the spiral product servo pattern;
- a first servo demodulation channel configured to demodulate the first waveform based on a first clock frequency to produce first servo data;
- a second servo demodulation channel configured to demodulate the second waveform based on a second clock frequency to produce second servo data;
- and
- a storage media controller configured to receive the first servo data and the second servo data effective to track the spiral seed servo pattern and the spiral product servo pattern.
6 more elements
A method comprising:
- receiving, from a first read element, a first waveform associated with a spiral seed servo pattern on a media disk;
- demodulating the first waveform based on a first clock frequency to produce first servo data;
- receiving, from the first read element, a second waveform based on a spiral product servo pattern on the media disk;
- demodulating the second waveform based on a second clock frequency to produce second servo data;
- and
- providing the first servo data and the second servo data to a storage media controller effective to track the spiral seed servo pattern and the spiral product servo pattern.
3 more elements
A System-on-Chip comprising:
- a first servo demodulation channel configured to:
- receive a first waveform from a first read element, the first waveform associated with a spiral seed servo pattern on a media disk;
- and
- demodulate the first waveform based on a first clock frequency to produce first servo data;
- a second servo demodulation channel configured to:
- receive a second waveform from a second read element, the second waveform associated with a spiral product servo pattern;
- and
- demodulate the second waveform based on a second clock frequency to produce second servo data;
- and
- a storage media controller configured to receive the first servo data and the second servo data effective to track the spiral seed servo pattern and the spiral product servo pattern.
7 more elements
Dependencies are inferred from the claim text.