I tried the proposed solution using a usb dvd drive. I bought an usb2ide adapter (google for ADU2IDE-N133), which was just cheap (with usb cable ~15 euro) and some blank dvds (TDK DVD-RW). Burned my image using blindwrite and everything works simply perfect. In addition, I will now be able to hot (un)plug my dvd and I dont have any ide drives connected.
Same procedure works for Rush for Berlin.
Thanks a lot for the tip
