I haven't backed up in 10 days (so Time Machine told me), so I connected my back up drive and let TM have at it. But several minutes later, I got a warning message saying that the drive could not be located. I opened preferences, checked out TM and it said the back up was delayed...b/c it couldn't locate drive. Unplugged, re connected, same response. TM said the next back up was in about 15 minutes so I waited to see if it would automatically back up, but again still same response. Repointed TM to that drive as the back up drive...but nothing new. I even opened the drive through finder and thankfully, all my back up files are there. Seems odd, but I wonder if it was b/c I haven't backed up in 10 days? Don't know why but that seems to be the only link. BTW, I am using a Maxtor One Touch II, 200GB which is only half full. Never had this happen before. Any ideas what might be causing this? Or better, what I might do to fix it? Thanks.