Transducing system.

摘要

The surface of a magnetic recording disk (M) is encoded with optically sensed indicia (OT), which is employed to control track following of a read/write slider (17) carrying a magnetic head (19) along a magnetic recording track (MT). The optical reader is a laser (21) carried by the slider which co-operates with the disk as a reflector which completes the lasing function or modulates the operating characteristic of the laser. The retro-reflected light changes the operating voltage of the laser diode. The disk is coated with a multiple layer optical recording medium deposited upon the upper surface of a magnetic recording layer.