Is it still giving you problems? Not a whole lot of information on it (surprisingly most of the complaints seem to be coming from Mac and Linux users); I guess it doesn't help that the error messages are rather vague. Yeah I'd probably wipe it clean just in case the file system structure is corrupt or something. Then use the Safely Remove Hardware option in the future, along with Unlocker if it gives you that 'drive in use' error.

I'll probably drop the book into your mailbox sometime tomorrow, I think.