MAGNETIC SCANNING SYSTEM

摘要

A scanning device for scanning data-carrying disks. The disks (11) include a magnetisable layer (121) to and from which data is written and read using a magnetic transducer (900), such as a Giant Magneto-Resistive (GMR) transducer (23a, 23b, 23c, 23d, 50) . Positioning of the transducer over a data track is achieved by optical tracking using a land/groove structure (13), and positioning of the transducer with respect to the optical tracking system by means of a reference beam (130) transmitted through the disk.