Back to results
US 11,557,319 B1Granted
Read offset calibration for error recovery
AssigneeSeagate Technology LLC
InventorsZheng Wang, Ara Patapoutian, Jason Bellorado, William M. Radich
Life of this patent
Estimating the term…
Abstract
A hard disk drive includes a magnetic recording medium comprising data sectors along a data track, a read head arranged to read data from the data sectors, and an integrated circuit. The integrated circuit includes circuitry programmed to detect a read error associated with a first of the data sectors and continue to read data from the data sectors after the detection of the read error.
Claims20
A method comprising:
- determining errors in reading data sectors in a data track;
- calculating read offset proxy values of the data sectors associated with an error based, at least in part, on a position error signal;
- calculating an average of the read offset proxy values of the data sectors of the data track;
- and
- determining an estimated read offset value for the data sectors associated with the error based, at least in part, on comparing the read offset proxy values with the average of the read offset proxy values.
2 more elements
A hard disk drive comprising:
- a magnetic recording medium comprising data sectors along a data track;
- a read head arranged to read data from the data sectors;
- and
- an integrated circuit including circuitry programmed to:
- detect a read error associated with certain of the data sectors,
- after the detection of the read error, continue to read data from the data sectors, and
- cause adjustment of a radial position of the read head in response to a determined read offset direction that is based on whether respective read offset values of the certain data sectors are greater or less than a reference value for the data track.
4 more elements
A system-on-a-chip (SOC) comprising:
- a read/write channel configured to:
- calculate a read offset proxy value for each data sector of a data track,
- detect an error in reading a first data sector of the data sectors,
- calculate a reference value for the data track based on an average of calculated read offset proxy values, and
- compare the reference value to the read offset proxy value associated with the first data sector;
- and
- a servo controller configured to:
- cause adjustment of a position of a read head in response to the comparison.
5 more elements
Dependencies are inferred from the claim text.