I guess I won't worry about my habit of saving data across multiple external drives - it saved me a lot of grief when one of those drives dropped dead.

Last night, I noticed that the data on one of my drives was corrupt - fortunately, I only lost a handful of data that exists in multiple other locations (I've been using the drive mostly as a staging area for posting to the website). I copied off what was copyable, and rebooted so that I could try reformatting the drive. Good thing I did the copy first; after rebooting, Windows didn't think the drive had anything on it at all. I've moved the drive over to the Mac in hopes that I can at least re-format it - but it looks like a total loss at this point.