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US 8,526,133 B2Granted
Systems and methods for user data based fly height calculation
AssigneeLSI Corporation
InventorsHaitao Xia, George Mathew, Ming Jin, Shaohua Yang
Life of this patent
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Abstract
Various embodiments of the present invention provide systems and methods for calculating and/or modifying fly height. For example, a circuit for calculating fly height is disclosed that includes: a first pattern detector circuit, a second pattern detector circuit, a first pattern fly height calculation circuit, a second pattern fly height calculation circuit, a first averaging circuit, a second averaging circuit, and a combining circuit.
Claims20
A circuit for calculating a fly height value, the circuit comprising:
- a first pattern detector circuit operable to identify a first pattern in a received data set, wherein the received data set corresponds to user data disposed between a first servo data region and a second servo data region;
- a first pattern fly height calculation circuit operable to calculate a first fly height using data values corresponding to the first pattern to yield a first pattern fly height output;
- a first averaging circuit operable to average the first pattern fly height output with other instances of the first fly height output to yield a first averaged output;
- a second pattern detector circuit operable to identify a second pattern in the received data set;
- a second pattern fly height calculation circuit operable to calculate a second fly height using data values corresponding to the second pattern to yield a second pattern fly height output;
- a second averaging circuit operable to average the second pattern fly height output with other instances of the second pattern fly height output to yield a second averaged output;
- and
- a combining circuit operable to combine at least the first averaged output and the second averaged output to yield a composite fly height value.
5 more elements
A method for fly height modification, the method comprising:
- receiving a data set, wherein the data set is derived from a storage medium via a head assembly, and wherein the data set corresponds to user data disposed between a first servo data region and a second servo data region;
- identifying a first pattern in the received data set;
- calculating a first fly height using data values corresponding to the first pattern to yield a first pattern fly height output;
- averaging the first pattern fly height output with other instances of the first fly height output to yield a first averaged output;
- identifying a second pattern in the received data set;
- calculating a second fly height using data values corresponding to the second pattern to yield a second pattern fly height output;
- averaging the second pattern fly height output with other instances of the second fly height output to yield a second averaged output;
- combining at least the first averaged output and the second averaged output to yield a composite fly height value;
- and
- modifying a distance between the head assembly and the storage medium based at least in part on the composite fly height value.
7 more elements
A storage device, the storage device comprising:
- a storage medium including a first servo data region, a second servo data region, and a user data region disposed between the first servo data region and the second servo data region;
- a read/write head assembly disposed in relation to the storage medium, wherein the read/write head assembly is operable to provide an electrical signal corresponding to the user data region;
- an analog to digital converter circuit operable to convert a derivative of the electrical signal to a data set corresponding to the user data region;
- and
- a first pattern detector circuit operable to identify a first pattern in the data set;
- a first pattern fly height calculation circuit operable to calculate a first fly height using data values corresponding to the first pattern to yield a first pattern fly height output;
- a first averaging circuit operable to average the first pattern fly height output with other instances of the first fly height output to yield a first averaged output;
- a second pattern detector circuit operable to identify a second pattern in the received data set;
- a second pattern fly height calculation circuit operable to calculate a second fly height using data values corresponding to the second pattern to yield a second pattern fly height output;
- a second averaging circuit operable to average the second pattern fly height output with other instances of the second pattern fly height output to yield a second averaged output;
- a combining circuit operable to combine at least the first averaged output and the second averaged output to yield a composite fly height value;
- and
- a fly height adjustment circuit operable to modify a distance between the read/write head assembly and the storage medium based at least in part on the composite fly height value.
10 more elements
Dependencies are inferred from the claim text.