Abstract: An information recording apparatus with a disc loaded in an oblong-shaped cassette, in which the flexible information recording disc comprises a solid centering hub. The apparatus comprises a drive with a writing-reading head, a driving motor for rotating the disc and a guiding assembly for moving the head along a path. The cassette has an opening for the introduction of the head arranged in a corner region thereof, and the center point of the path of the head movement falls near to the longer side wall of the cassette that leads to the corner near to the opening. The head guiding is designed in such a way that during the head movement the relative position of the head and the information recording tracks on the disc is constant within a negligable range of tracking error.

Abstract: A method for recording track marking information on flexible magnetical information carrier discs, in which the circular tracks on one side of the disc are each divided into an information recording segment having an angular width of at least 270.degree. and a remaining track marking segment, and in this latter respective marking frequency signals are recorded so that each of these signal is distinguishable from those recorded on the two neighboring tracks.The invention relates to an apparatus for fine adjustment of the position of a reading head in case of discs recorded by the above method. The apparatus comprises frequency selective means that selects the marking frequency components when track marking segments are played back. The difference of the sensed components are processed to a control signal which drives a control unit for adjusting the radial position of the head to the center line of a predetermined track.