摘要:
A magnetic memory comprises a base (11), a spindle (31) upstanding therefrom, a motor comprising a stator 34 and a rotor 52, 56, a hub 37 mounted on bearings 41, 42 to rotate relative to the spindle, a pack of magnetic discs mounted on the hub, magneitc heads 65 for recording or playing back information on the disc, a drum 71 mounted on the hub and magnetic heads 81 mounted on the spindle, for recording or playing back tracks on a tape supported by the drum.