Just a side note .. the issue doesn't appear to really be accessing the size of the drive. As when I first tested it ... I used my 2TB external drive that I was planning for my 722k ... the box had *no problem* identifying the drive, and it even formatted, and when it was done **THEN** it told me.. it wasn't supported.
So I think the only limitation here.. is that dish isn't into supporting a larger external size and thus forces it to be less than X bytes. That said.. I would still love to see DISH go to modularized/tray mounted drives .. so that replacing them is a simple task, rather than having to replace the whole unit when a disk fails... just send the drive.. and also see them support and ADD MUCH LARGER drives into the 722k... 500G may be larger than some companies (just checked Comcast's site, which says they have up to 120g on HD DVR recorders and do 20 hrs of HD .. stupid) but still .. the price of drives is so very cheap compared to years ago.. that this 500G is just ridiculous!