And she changed it from AHCI to compatibility mode (had to change itto that mode to make the drive being recognized?), which is not the best setting regarding speed.
Alexander: The she is actually a he :)
Quite right, sorry, I'd read it backwards. So presumably either a bug in the AHCI support, or a limitation/bug of the kernel driver? jh
John: Actually, this is a complete false alarm.
Actual Solution: You don't have to change anything on these laptops. But it is a good tip that when installing from external cd/dvdrom, if it first does not work, change usb port and try again.
I changed back the BIOS to AHCI. I was previously plugged into the top left USB port I.e. the one on the left hand side closes to the monitor or back side.
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 :)
Cheers, Janne "Janski" Nyman E: jnyman@jbtec.org