There are in fact 3 partitions (but only 1 for recorded content). To see them you need to look at the disc on a PC.
One of 1 GB for the epg, one of 10GB at a guess for streamed content and the rest for recorded content. The Foxsat-hdr has two partitions for storing recordings, one for Video and the other for jpeg/mp3s the assignment is adjustable by formatting both. That's where the confusion is coming from.