Continuous spiral mode tracking in a conventional disk drive using concentric servo tracks
US4107746A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1977 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Oct 25, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/596
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a conventional disk drive device using concentric servo tracks to operate data heads on concentric data tracks, a second mode of operation is provided which is compatible with the use of concentric servo tracks for driving the data heads in a spiral, continuous mode for accessing all of the data on a particular disk surface in a single data read or data write operation. A conventional computer system disk drive could be modified for occasional use in storing and retransmission of video signals. In the preferred embodiment of the invention, each servo track is provided with a once per revolution clock pulse which starts the operation of an integrator. The integrator generates a time varying signal of the same period as the time for one revolution of the disk pack. An error signal is generated by conventional means to indicate the error in position of the servo tracking head with respect to the servo track. The signals produced by the integrator and the servo error position signal are used to continuously drive the servo positioner causing the data and servo heads to make a spiral track on the disk. While the data head is in the spiral tracking mode, the servo head is referenced w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.