Bah! what I did was buy a WD Passport portable USB drive. Cracked it open, pulled the SATA notebook drive out, and used that - plugs right into standard SATA connectors.
Not quiet enough? Too expensive? Okay fine - head for eBay and get a CF/IDE adapter. Here's one that just
ended. These are DIRT cheap, use standard CHEAP C/F, and with a dual device you ought to be able to get a good bit more than 2Gigs on there without a second mortgage. I bought one of the single ones before I knew about the duals but have not yet tested it. IMO if you want low power and quiet this would be an excellent way to go and possibly cheaper than the store found earlier
I don't mind spending money but I'll go cheap when I can and these little CF things were kewl enough and cheap enough I bought one a few months ago without even a need. Maybe if we get XBMC cut down enough I'll put it to use!