Servo positioning system for disk drive system
US4682253A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Apr 23, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59611
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved servo positioning system for a Winchester disk drive system is disclosed. A plurality of concentric servo tracks are provided on the surface of one disk. Each track is comprised of an equal number of frames of a preterminded length. Four basic frame patterns are utilized. In addition, a frame may also have a code bit in a predetermined position, in order to define the frame as a "one" or "zero" frame. The servo data is read by a dedicated servo head, digitized and fed to a logic array which receives as its only other input an 8 megahertz clock signal. The logic array detects the sync signals present in each frame and generates index, guardband and no sync signals therefrom. In addition, a plurality of windows, each corresponding to a predetermined portion of each frame, is generated. Those window signals are utilized to control a window control circuit which sequentially enables four similar peak dectors, one for each window. The peak detected signals are utilized to form the phase and quadrature signals utilized to provide proper positioning of the heads over the desired track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.