Method and apparatus capable of identifying different types of disk-shaped information storage media

Abstract

This invention provides a method and apparatus for automatic type discrimination of differently sized disk-shaped information storage media, wherein pulses in a signal generated during the initial rotation and the associated elapsed time are counted and used to detect the size of the disk-shaped information storage medium. The method according to this invention comprises the steps of detecting signals produced from a driving unit for rotating a disk-shaped information storage medium; and identifying the type of the disk-shaped information storage medium according to the size thereof on the basis of comparison of the detected signal with a reference signal. This invention enables to detect the size of the disk-shaped information storage medium in a shorter period time compared to the conventional art because the initial time duration needed to get a desired stable rotation speed, which depends on the size of the disk-shaped information storage medium, is no longer required.

Dependencies are inferred from the claim text.