Guy wrote: I looked through FAST05 and found a few CMU papers but nothing that looked like that. If/when you find the link I'm very interested. My anecdotal experience is based entirely on a hatred of unnecessary technology especially RAID controller failures (there must be a curse: the controller barfs or loses its config more often than drives fail!) Interesting side point: in several case I've been able to find files (tape images that I made a decade or two ago) that I had misplaced (not a drive crash but simply losing them in the shuffle) by Googling for them and finding a copy of my tape image, in a directory name that I had made up twenty years ago, elsewhere on the web! I was astounded! Tim.