sentences:  There are 2 internal disk bays which support any off the shelf SATA hard drive up to 1TB in size.Lee Devlin was the hardware architect for the HP Media Vault and he maintains an unofficial support site for the device.The site includes information on hard drive replacement, restoring a previous snapshot of your pc, photos of the device internals as well as setting up a Firefly/iTunes Experimental server amongst many other articles.