Very high-density diskette format method and computer implemented process
US5515212A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1993 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Aug 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2512
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of servo grooves on at least one of said sides of said media that have stitched patterns that will alternate on-and-off at twenty kilohertz in the presence of a constant, unmodulated light source. The diskette is magnetically formatted with reference and data tracks recorded in such a way that extremely accurate position determinations can be made by looking at the analog amplitude of the detected tracks and comparing them at different head positions. The innermost tracks contain redundant copies of a disk mapping table that comprises data for a media type code, a sector size code, a sector interleave code, a total track count, a reassignment area starting address, a data area starting address, a total sector count, an update count, and a reassignment table having at least room for 250 entries of three bytes each.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.