@SamuriHL ok, understand The externe drive LG BH16NS55 with ASUS 3.02 is connected via USB 3.0 and and makes BUS problems more often. Power off, power on, and drawer open and close, after three four attempts starts AnyDVD and scans the disc, or never. :-( Only for unsupported discs. If I insert a supported disc, AnyDVD starts immediately and scans the disc. If I immediately insert the unsupported disc again, AnyDVD does not start now and the drive starts "sawing". If I insert a supported disc again, AnyDVD starts immediately and scans the disc. The intern drive ASUS BW-16D1HT 3.10MK is connected via SATA and only makes BUS problems from time to time.