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US 9,001,445 B1Granted
Multiple sync mark storage system
AssigneeLSI Corporation
InventorsRui Cao, Haitao Xia, Lu Lu
Life of this patent
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Abstract
A data processing system includes a number of analog to digital converters operable to sample analog signals obtained from a magnetic storage medium to yield digital signals, multiple sync mark detectors operable to search for a number of different sync marks in the digital signals, and a sync mark detector output comparator operable to compare an output of each of the sync mark detectors to identify detection errors.
Claims20
A data processing system comprising:
- a plurality of analog to digital converters operable to sample analog signals obtained from a magnetic storage medium to yield digital signals;
- a plurality of sync mark detectors operable to search for a plurality of different sync marks in the digital signals;
- and
- a sync mark detector output comparator operable to compare an output of each of the plurality of sync mark detectors to identify detection errors.
1 more element
A method for detecting a location of user data on a recording medium, comprising:
- receiving a plurality of data inputs from an array of read sensors for a data track on the recording medium;
- searching each of the plurality of data inputs for a different one of a plurality of different sync marks to detect a location of user data on the recording medium to yield detection results;
- and
- comparing the detection results to determine which of the plurality of different sync marks was correctly detected.
1 more element
A storage device, comprising:
- a plurality of analog to digital converters operable to sample analog signals obtained from a magnetic storage medium to yield digital signals;
- a plurality of sync mark detectors each operable to receive one of the digital signals and to calculate a metric representing a difference between said one of the digital signals and one of a plurality of different sync marks;
- a sync mark detector output comparator operable to identify one of the plurality of different sync marks as detected when an associated one of the metrics has a lowest metric value and is below a threshold;
- a correlator circuit operable to calculate a correlation of one of the plurality of different sync marks from an adjacent data track with the digital signal from a target data track based on an output of at least one of the plurality of sync mark detectors;
- and
- an offtrack computation circuit operable to calculate an offtrack position coefficient based at least in part on the correlation.
3 more elements
Dependencies are inferred from the claim text.