On Raspberyy PI I connected a 1TB usb 3.0 and it works.
Because this disk has no separate power supply and usb power on the plug
is normally limited to 0,5 A I added in /boot/config.txt:
max_usb_current=1
(to save the file first change write-permissions so log in as root )
I presume you can use diskdrives with separate power supply too, but I red that the partitionsize in Max2Play is limited to 2 TB.
Probably you can use multi-partitioned disks and I noticed (but did not yet try it) that there is a very user friendly way to setup the use
of NAS drives in Max2Play.