Method for measuring magnetic write width in discrete track recording
US7843658B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2008 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Jan 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/743
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of measuring a magnetic write width includes forming a data track on a discrete track medium by a write operation at a first frequency, performing write operations at a second frequency that is different from the first frequency, at both side positions along the formed data track, obtaining a track profile by scanning the data track in a track-width direction, using a magnetic field detection element, calculating an integrated profile of the obtained track profile, obtaining profile integrals by setting a distance from the data track to a position of the write operations at the second frequency to various values and by calculating the profile integrals for the respective values of the distance, and calculating a magnetic write width of the magnetic head and a magnetic write width of the discrete track medium from a relationship between the distance and the profile integrals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.