Floppy disc drive unit
US4656533A · kind A · utility
47Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1984 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Oct 22, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a floppy disc drive unit, the rotational speed of a floppy, a write current fed to a write head, electric characteristic of a signal processing circuit in a read circuit are all controlled so as to set them to values suitable for selected mode corresponding to magnetic recording data density. A switching signal is either manually produced or fed from an external circuit so as to effect switching between normal density mode and high density mode. The floppy disc drive unit according to the present invention is therefore capable of handling floppy discs of different density values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.