is that an external hard drive? I think I"ll just get the additional memory card and that wshould be enough of mostly photos and some key short video for a 4 day cruise. I have 2 quarter gigs and just ordered a 2-gig card to pick up tomorrow. I guess I can always have the ship burn a ced for me if I need more room, which I don't think I will. With 7.0 megapixel, even the low res will be nice enough!