At the risk that this has been sorted out in previous forums, I'm posting it (again) here. I've been using a 500GB Western Digital USB drive for time machine before getting the Airport express, but now that I have the latter, would like to do wireless backups. It wasn't clear to me from the posts in various forums whether I have to reformat the drive even in this case, which would suck because I'd have to find temporary storage room for all the data. The drive doesn't appear in the finder at present, and is not visible to Time Machine. Thanks in advance for any advice on this. PS: Also, since I'd like to both print and backup wirelessly, I need some USB hub solution I guess. Any recommendations for products?