Self servo writing file using the widest head
US5949603A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1999 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Jan 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/322
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A self servo writing file and method for writing servo patterns in a direct access storage device are provided. First servo information is written on a data storage media at a first crash stop. The transducer heads are moved offset from the written servo information while reading the last written servo information until the detected servo signal equals a predetermined value. Then servo information is written on the data storage media responsive to the detected servo signal equal to the predetermined value. The moving and writing steps are sequentially repeated until a second crash stop is reached. A quad-burst servo amplitude pattern or phase pattern can be used for the servo information. The servo writing method is adapted easily for many different servo options. When the file uses a hybrid servo or sector servo, the other surfaces can be written by duplicating the servo bursts with a high bandwidth servo system of the file. Alternatively, the servo writing steps can be repeated for each of the other surfaces for providing head dependent pitch. Variable track pitch can be provided by selectively varying the predetermined value compared with the detected servo signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.