By starting up the Super 6 in a couple of special bootloader modes, the internal hard drive can be mounted on a computer desktop to give access to files.
According to their firmware update instructions, the boot disk on the Super 6 is about 2.7MB in size, so I would have assumed it to be some form of flash storage rather than a hard drive.
If there really was a hard drive in it that would certainly be worth knowing but I have a suspicion there isn't one, which I think is better than if there was one due to the longevity issues associated with hard drives as most people understand the term.