I have 5 HDD's for 330 G. One, a 40 G drive holds my four OS's. XP Pro, Whatever LH is current, Server 2003 and Linux (UBUNTU). The second is 74 G and holds all my backups plus archived programs so that when I do a reformat/reinstall of XP I don't have to spend hours and hours scouring the internet to replace all my favorite applications. Especially those which are older, but in my opinion better, versions. The third is 80 G and is used like a common Program Files folder where all my installed Windows applications live (I use nLite to export my Program files folder to this drive) as many of them only require one installation but can be called from any Windows install (I export shortcuts to the various Windows installs). Of course this doesn't work with applications that use the registry, but it does for almost everything else. The other two totaling 140 G's are for data which for one reason or another hasn't been burned to a CD or DVD. I've been into computers since the '70s and can quite well remember when there were no hard drives. And I remember sitting in darkened rooms with a small flourescent light (for the 60 Hertz flicker) carefully timing floppy drive motors so as to squeeze DS/DD out of DS/SD drives. There is never enough storage.