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As far as I am aware it doesn't have a USB port on it so no it can't. The V10 will play certain video and picture files off a media server but sadly not music. The TV itself comes with a twonky media server program they give you a key for to download.
Sorry makthedon i havn't got a BD80 to try the external harddrive with, but I've just had a quick look through the manual on Panasonics website and found this.
It appears you can use one with it, but there are constraints on its capacity and format. Hope this helps.