High density servo tracking
US5291348A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Apr 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/103
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique for operating a data storage medium, such as a magnetic tape cartridge, by writing pairs of buried servo data tracks having alternating flux densities. A servo read gap is used to locate the on-track position at the border between a pair of servo tracks by detecting a fixed relationship, such as a predetermined proportionality correction factor, between the signals read from each track. Information data read and write gaps are mounted to the servo read head to create a plurality of information data tracks, each one half or less the width of a servo data track or smaller and separated from the next track by one half the servo track width. Information data tracks are formed in these separations between tracks by positioning a second servo data read head at a distance equal to the width of an information data track pitch from the first servo read head while using the second servo read head to locate the on-track position. The flux density transitions in the servo data tracks are at a substantial azimuth angle, such as 45.degree., from the direction of motion of the tape to minimize interaction between the servo data and the information data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.