Method and apparatus for tolerating track misregistration systems in twin track vertical recording systems
US4799115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1986 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Oct 27, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5526
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Track misregistration between a read-back head and a previously recorded pair of tracks can cause erroneous data to be detected by the read head. It has been discovered that a prior erasure to eliminate any residual magnetization reversals occurring between and along side of the two parallel data tracks in twin track vertical recording can unexpectedly increase track misregistration tolerance by several hundreds of percents over the tolerance exhibited by twin track vertical recording having no pre-write erasure in the space between tracks and along side of the tracks. The erase before write technique may be practiced with a new read-write head structure having an E-shaped erase core aligned with the twin track read-write head and insulated from it to precede the read-write structure in the direction of relative motion between the read-write head structure and the magnetic medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.