You may get away with the first disk, but unless you create Lite versions of W2K and XP, you will not fit them both onto one cd - certainly not slipstreamed with hotfixes and service packs. Traditionally, the X-in-1 cds have focussed on one core OS and added variants, e.g. W2K Pro, Server and Advanced Server. The reason is that because of the commonality of files in each distro, optimisation can be used by e.g. cdimage.exe. This optimisation removes duplicate files and replaces them with a pointer, thus compressing 1.5GB into less than 700MB. W2k and XP do not share enough common code to make optimisation work. When you do get yout DVD burner (<50$), I would recommend CDShell with BCDW plugin to do the multiboot work. Both products come with excellent example scripts to modify.