.\" $NetBSD: prep,v 1.6 2002/06/29 09:33:10 lukem Exp $ . If you have any data on your disks that you want to keep, .Em back it up before starting. Note that .Nx*M does not support booting more than one operating system from a single disk, although it's fine to have multiple operating systems on your machine if you have a separate disk for .Nx , or if one of them uses a network boot.