servosystem to magnetkopfausrichtung for a magnetplattenvorrichtung with a multi track magnetic head and methods for its use.

摘要

The drawing shows a pattern of servo signals prerecorded in a magnetic recording disc. The pattern comprises groups (44 to 47) of prerecorded elements A, B arranged along radial lines (40 to 43) of the disc within data tracks (60 to 65). The groups (45, 47) on tracks (63 to 65) lie between the groups (44, 46) on tracks (60 to 62). The disc is for use in bringing or maintaining a read/write head assembly having a plurality of read/write head elements (50, 52) aligned with the centre lines of the data tracks (60, 63) with which the head elements (50, 52) are aligned. The head elements (50, 52) read alternatively the servo signals (44, 45, 46, 47) and provide a sequence of signals which are combined to provide a single signal containing information about the positions of the head elements relative to the centre lines of their aligned data tracks. From this signal a correcting signal is generated and is supplied to the actuator used for moving the head assembly radially across the disc surface to correct any mis-alignment.