Well, it might be one of those annoying phantom itches that isn't really DUE to anything, but you still scratch it...
It probably comes from all the times that I've had to reinstall a system, and the first step is to sift through all the garbage and find the files that you actually want to keep and save those somewhere....and so I always end up saving tons of stuff into a directory called "rob_C_drv_backup" onto another hard drive somewhere else, and never going through and really pulling out the good stuff, so it just sits there taking up space on some spare hard drive....
I know that doesn't have much to do with the topic at hand....I really haven't had much of a need for a huge drive, as I have no media that I store on a regular basis. Our 2 main PC's are doing fine with 200 GB, and on the few times I've run out of space, I can usually go in and delete some un-used and forgotten application to free up the space. So, I guess what makes me itch is the idea of having so much space that I never do ANY housecleaning....because I know I wouldn't.
I am being lured by the idea of getting some large drives for a WHS system to back up everything else. If the backup drive fails...who cares, so long as the drives it was backing up don't fail at the same time!