Basf Aktiengesellschaft

Walter Huber

Joachim Hack

Klaus Schulze-Berge

Roland Sold

Gerold Kraus

A method and an arrangement for detecting error signals in a magnetic disk drive apparatus uses a test disk which has a plurality of test tracks distributed over the recording area and containing special test signals, a distinction being made between orientation, adjustment and azimuth bursts. Based on the normal position of the recording tracks of the magnetic disk, the spacing of the test tracks could depend on the type of step motor if such a motor is used in the positioning device. By special control, hysteresis errors can be measured in addition to tracking errors, eccentricity errors and azimuth errors. An advantageous use is for all types of disk drives, preferably FlexyDisk drives.

Method and arrangement for detecting error signals in a disk-drive, and

A process for the analysis of aqueous solutions, in which the sample is introduced into a stream of liquid color reagent and the reaction product formed in a chromatogaphic column under pressure is measured in a suitable detector.

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Ludwigshafen, Germany

Walter Huber