Good news, have ordered some new HDDs to rescue the file storage box, and they will be with me tomorrow
Bad news, the Popcorn Hour's HDD has now given up the ghost
Good news, it wasn't the HDD, it was the PSU
Bad news, common consensus is that you can only get them from PCH in the US, for $27+$35 shipping (and customs cost)
Good news, I have found that PCH in France has stock of them for £45 including shipping
Bad news, possibly, it will maybe arrive whilst I am in France