Creating an array with up to eight hard drives can be done easily. We used seven Seagate NL35 drives and one Barracuda 7200.8 at 400 GB each ; the Barracuda is the same type of drive, but lacks validation for 24/7 operation.
Buyers need to be very aware of limited compatiblility with many of today's MB. Will not work in many machines. Highpoint Tech support is one of the worst I have worked with. No indication of any technical ability in those I have worked with.