Disk drive with staggered calibration bursts that are disposably located in data regions and method of using the same for calibrating a read head
US6198584A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1998 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Apr 30, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59683
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive with a disk having a servo pattern including a special "calibration track" wherein a plurality of staggered calibration burst pairs define null points that are radially shifted from a burst pair centerline by precise, predefined, fractional track amounts to collectively provide accurate information about servo signal values generated as a function of real displacement. The staggered calibration bursts beneficially allows for calibrating the PES signal after the drive is removed from the servowriter during a manufacturing phase called Intelligent Burn-In. The staggered calibration bursts are preferably written in data regions so that they are disposable and may be selectively written over with data to maximize storage space. Some or all of the calibration bursts may alternatively be retained for a subsequent recalibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.