Originally Posted by
nkedel
With luck, the X201 will have come with it on -- turning on AHCI in the BIOS is easy, but Windows does not always play well with that change having been made. When it works, it "just works" but when it doesn't, doing the switch involves a couple of reboots and a couple of registry changes which -- while not rocket surgery -- aren't the most comfortable things for non-technical users to mess with.
Also, more than a few laptops (including my most recent HP) don't include an AHCI switch in the BIOS.