Method for inspecting track pitch in a magnetic disk
US7242551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2005 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Jul 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the invention provide techniques to inspect the track pitch of a magnetic disk. In one embodiment, the track pitch is inspected using the servo information that was written onto the magnetic disk. A PES gain is set to be PG0. A head is moved to a position K near the position where control is to switch between MPES and SPES, and then MPES and SPES are calculated using reproduced burst signals and PG0. The quantity of change in the inspection HSP which is a half-servo pitch of an inspection-related burst pattern, with respect to an ideal half-servo pitch, is detected by calculating PESΔ, the difference between the MPES and SPES at position K. The track pitch is thus judged whether it is abnormal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.