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

US4623942A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerold Kraus · Lahr (Eifel), DE
• Walter Huber · Traunstein, DE
• Joachim Hack · Ludwigshafen, DE
• Klaus Schulze-Berge · Ludwigshafen, DE
• Roland Sold · Mutterstadt, DE

Key dates

• Filing date: May 15, 1985
• Grant date: Nov 18, 1986
• Expiry date: May 15, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B20/182
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

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.