Abstract: An auto-ejector incorporated in a disk recording and/or reproducing apparatus is driven by a disk driving motor and a head driving motor which are requisite for the apparatus. That is, the ejector is triggered under the power of the head driving motor, and a disk cartridge in which a disk is accommodated is ejected under the power of the disk driving motor. Thus, any device, such as an electromagnetic device, a motor or the like used only for the ejector is not needed.

Abstract: A tracking servo for a floppy disc drive or the like employs a plurality of servo tracks recorded between adjacent data tracks on the floppy discs, with the signals from adjacent servo tracks on both sides of a data track being used to define the difference between the position of the magnetic head and the center line of the data track being accessed, and an adder is used to add the current position of the head to the product of such difference multiplied by a constant, with the sum delayed by the period of one rotation for comparison with the current position of the head, to derive a tracking control signal.