I have a 2010 Macbook Pro running, of course, Snow Leopard. I have had this error, however, for a long time, previously on my black Macbook, also running Snow Leopard. Here's the annoying problem. I have a stand on my desk at work where I have my Time Machine drive and a keyboard, mouse and monitor. When I eject the Time Machine drive to take my laptop home, I get (I assume every hour or so), an error that "the backup disk is not available". I know it's not available. Even when I turn Time Machine off, I still get it. When I try to watch a movie on Netflix or a ballgame on ESPN3, I always get interrupted by this error. It always pops up on top so it trumps everything unless I am in Front Row. Is there any way of getting this error message to go away? Telling me one time is fine, but every hour for ever is really annoying. I would think that even turning off Time Machine altogether would certainly stop it, but it doesn't. Any suggestions (or preferrably help based on experience) would be great. Thanks in advance!