Gigablue HD 800 Hard Drive Install

Hi everyone,
could anyone tell me if you can put a hard drive inside the above model, if so what size can they be up to and any recomendations for which brand. Ive put one in a VU+duo so pretty familiar with installing them.

Thanks in advance

thanks for the reply. Thats where i think im going to buy one. Im sure theres a bay inside like the VU+Duo to take one and theres an option on the quad version for a fitted hard drive with world of sat. Might have to email them to ask about it.