After update to fedora f9 (kernel-2.6.25-14.fc9.x86_64), when I insert a cdrom with vbox loaded (after starting a virtual machine running XP), I get lots of: May 14 11:27:16 nbecker1 kernel: sr 3:0:0:0: [sr0] unaligned transfer After unloaded vboxdrv kernel mod, it works normally.