Optical disc with non-circular aperture

摘要

A data storage device 10 has a rotatable data carrying medium 12, such as a compact disc or DVD, which has an optically readable data carrying portion 14 and a non-data carrying portion 16. The non-data carrying portion 16 has a non-circular first aperture 18 and a circular second aperture 20 cut therein. When a data storage device 10 is inserted into a suitable data reading device, such as a games console, a plunger of the data reading apparatus engages second aperture 20. This causes actuation of a microswitch connected to the plunger which allows the operation of suitable data reading means.