I am using the Iomega External USB 2.0 500GB hard drive. It is for sale at Amazon as well as other places. It is $119.99 at Amazon, or $114.95 on techonweb.com. It works well with my 622, and it priced very nicely. I have been using one which is almost filled up now, and I have a 2nd one on its way to me. (Can't beat being able to grab high-def movies for about $2.00 per movie!)