Harmonic sensor phase error detection for data storage devices
US12374362B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 2024 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Sep 19, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Example systems, data storage devices, and methods for using a harmonic sensor in the read channel of a data storage device to determine phase error are described. The data storage device includes a storage medium with data tracks and a head that can be positioned for reading and writing those tracks. A tone pattern may be written to a data track and a read signal from the tone pattern may subsequently be processed through the harmonic sensor to acquire amplitude data corresponding differences between a target frequency of the tone pattern and a read frequency from the read signal. The amplitude data may be processed to determine phase error values that correspond to an operating condition during writing, such as mode hops and/or down track thermal gradients related to operation of a laser during heat assisted magnetic recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.