OS: CentOS 5.0 x86. I have an internal modem with a driver that works with CentOS 4.x but not with 5.0. So I am thinking of using Xen in conjunction to SL 4.x. My question is, does this require separate physical partitions for SL 4.x, or will these be part of a VM file or something with CentOS 5.0 as a host?