INFORMATION DISK DEVICE AND METHOD FOR DETECTING DIRECTION OF INSTALLED INFORMATION DISK DEVICE

摘要

The direction of installation of an information disk device is judged without using any sensor means. When read means (104) is moved in a radial direction of an optical disk (102) for a certain time by drive means (109), control means (116) counts the tracks that the read means (104) crosses. The direction of an installed DVD-ROM reproduction device (101) is judged from the count of the tracks crossed.