Head position determination control apparatus of data recording/reproducing apparatus in a data surface servo system
US5187620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1990 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Jan 30, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a composite servo system or a servo system using only a sector servo system, when a head switching mode is set during a read/write operation, a CPU checks whether the cylinder of a target track of a subsequent head after switching is the same as that of a target track of a preceding head. If the target tracks are located on the same cylinder, the CPU compares offset value data of a data surface corresponding to the head before switching with that of the head after switching. If an error, as a comparison result, falls within a predtermined allowable range, a read/write operation by the head after switching is continuously executed. The CPU generates correction data used for positional correction processing for positioning the head at the center of the target position of a hard disk and temporarily stores the correction data in a data memory. The CPU executes positional correction processing on the basis of the correction data stored in the data memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.