On Sun, 11 Sep 2011, Janne TH. Nyman wrote: > When lenovo's external CDROM/DVD is plugged into this port, I am unable > to install linux in general or other OS's. Once I plug it into any of > the other USB ports bottom left or right, it works perfectly. > > No wonder I haven't found any problem posts regarding x220 and > CentOS/RHEL. > > Thanks for all your time supporting me. Fantastic responses on this > mailing list. > > Use external CD/DVD ROM, just ensure to plug it into the right port :) I might be wrong, but is it possible that this port is USB3? That way the BIOS would be able to boot the CD from it, but neither linux nor windows is likely to have suitable drivers for using it. jh