A word of warning to Mybook users running Firefly. It may be completely unrelated, but my MyBook WEII with two instances of Firefly running, failed twice within the first year. Both internal hard drives failed within 3 months of each other. They were not configured for raid, so replacing a drive reformats both and you lose everything. To get warranty replacement you have to send in the whole unit, because the individual drives inside are likely out of warranty, while the unit as a whole is still warrantied.