Method for verifying servo data
US4516162A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1983 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Apr 21, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59611
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for verifying the integrity of servo data stored as a series of parallel servo tracks on a disk. Each track includes automatic gain control data and servo positioning data. The peak amplitudes of the automatic gain control pulses on a first track determine a first effective threshold or AGC gain level. The first threshold level is then shifted to a higher, enhanced threshold level. Servo data pulses from a second track are then detected, based on the enhanced threshold level and the AGC gain level of the first track. Should these servo data pulses not be fully detected, an error is recorded for the second servo track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.