There are various posts in the forum where folks have talked about specific drives they've tried, I'm not aware of any that didn't end up working for this generation of device though your mileage may vary.
32-bit devices in general have a 16TB volume limitation that I believe would apply for this device. So 10TB drives would probably work but combining 3 into a 20TB RAID5 array probably wouldn't.
Another limiting factor to think about is power/heat. You may be able to get just about any drive to work but having 4 running at once could provide heating issues in some configurations.
