Back to results
US 9,143,168 B1Granted
Method and system for removing interference caused by servo data from user data
AssigneeMarvell International Ltd.
InventorsZining Wu, Gregory Burd, Nitin Nangare
Life of this patent
Estimating the term…
Abstract
Reproduction of encoded data which includes a split-mark. FIR data corresponding to split-mark and FIR data affected by the split-mark due to inter-symbol-interference are identified. FIR data corresponding to the split-mark is removed from the received FIR data. Recovered data is created by removing incorrect inter-symbol-interference from the FIR data due to the split-mark, and adding correct inter-symbol-interference from codeword bits. The recovered data is stitched together with data unaffected by split-mark data.
Claims20
A method comprising:
- receiving encoded data, wherein the encoded data comprises (i) first data, (ii) servo data, and (iii) second data that is affected by a contribution of inter-symbol-interference due to the servo data;
- removing, from the second data, the contribution of inter-symbol-interference due to the servo data;
- adding, to the second data, a contribution of inter-symbol-interference due to the first data;
- and
- subsequent to (i) removing, from the second data, the contribution of inter-symbol-interference due to the servo data and (ii) adding, to the second data, the contribution of inter-symbol-interference due to the first data,
- generating user data from the first data and the second data.
3 more elements
An apparatus comprising:
- a reading unit configured to receive encoded data from a hard disk drive;
- a recovery unit configured to (i) remove, from the second data, the contribution of inter-symbol-interference due to the servo data, and (ii) add, to the second data, a contribution of inter-symbol-interference due to the first data;
- and
- a stitching unit configured to, subsequent to the recovery unit (i) removing, from the second data, the contribution of inter-symbol-interference due to the servo data, and (ii) adding, to the second data, a contribution of inter-symbol-interference due to the first data,
- generate user data from the first data and the second data.
2 more elements
Dependencies are inferred from the claim text.