Head positioning control device for a magnetic disk apparatus
US5475544A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | May 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5547
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A head positioning control device for a magnetic disk apparatus has a head selection circuit for selecting one of a plurality of magnetic heads based on an external head address, a servo control circuit for controlling a movement of a selected magnetic head to a prescribed position through a head positioning motor. A head positioning control unit sets prescribed control information in the servo control circuit based on an external instruction. A head address switching device is connected to the head selection circuit for receiving a head switching signal set by an external instruction, the head address and a burst-area information, and sending a prescribed head address to the head selection circuit. A sector pulse generator sends a sector pulse corresponding to a zone in which the magnetic head is positioned to the head address switching means. The head address switching means has a latch which, when a burst-area information is input, switches and outputs a head address input during an inputting of the burst-area information after the burst-area information becomes inactive. A first delay circuit outputs a signal flag indicating an existence of a head switching signal with the same…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.