Shutter controller, disc device, and computer program for determining that disc is caught

摘要

During a process of closing of a shutter of a disk device, a position of the shutter is detected. A first shutter position indicator indicative of a first position of the shutter and a second shutter position indicator indicative of a second position, which is immediately before the first position, are calculated. Whether a disk is pinched by the shutter is determined based on comparison of a predetermined threshold and the difference between the first shutter position indicator and the second shutter position indicator.