Methods and structure for improved disk head switching to avoid zipper zones
US7679851B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2005 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Feb 3, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/012
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and structure for switching heads on a multiple recording surface disk drive that uses bi-directional radial writing toward a zipper zone at a middle diameter. When switching from a first head to a second head, features and aspects hereof assure that the second head will not be positioned in the zipper zone of the corresponding second surface and hence will not lose track following servo synchronization and control. In one aspect, added buffer or guard tracks having valid servo information but no data are added on either side of the zipper zone to assure that under the worst-case misalignment of surfaces the second head will not be positioned in its corresponding zipper zone when switching from the first head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.