I've got a directory full of images that I'd like to expand to another drive, but I'm vary wary of doing this because it's essentially RAID-0. I do back this drive up once a month, and the data is really not important - if I lost an image it wouldn't be the end of the world. My question is, if I span it to a 2nd drive and that drive failed, would I be able to recover what was on the original drive or does one drive failure mean the whole spanned volume is toast? Secondly, if this were critical data, is the "right" way to go to RAID-5 or above at that point? Which would allow more drive space and retain fault tolerance? I've never had a reason to use anything but RAID-1.