Yep, and its working great
IF you want to buy an try a larger USB drive, I'd say make sure it's a single drive internally, and not some sort of odd hybrid or dual drive of some sort. Unless you want to set this up for recording to network storage, as it appears capable of doing that. In fact, that would by far be the best way to do it if you tend to keep stuff.
Perhaps the Mio can go much larger with local plugable USB drives, since it is 64bit. I just don't need anything larger than 2TB, as I typically watch and delete. Though I do save some things in a separate folder. If I ever get close to full (like my MicroHd's drive which was only 640Gb), I can off-load stuff to my network storage.
So basically, I can guarantee it'll see 2TB drives right now. If you want to buy one right away. The one I have is a: WD My Book Essential 2TB USB 3.0
Ok, I just read this on World of satellite forum:
"Linux/E2 can handle 8TB 3.5 drives".
You'd have to try and see what happens, because Windows can't see drives that large, if they are partitioned as MBR. Larger drives need to be partitioned as GPT.
Personally, the larger the drive just means you'll lose all the more files when it crashes. Unless you set up automatic backups to another storage.