Product details:

Mediasonic - ProRAID 4-Bay RAID EnclosureI bought this originally to do RAID5, but I felt only 4 drives in RAID5 was too much sacrificing for the hard disk space and I opted to get 5 bay system. I am selling this without drives so this one comes with 0TB. The good news is that you can add your own bigger drives drives upto 10TB on each bay. (Yes, this one is Rev. 3 which enables you to add 10TB drive) It works really great and I used it seldomly. I am now looking to get 5 drive bay version for RAID operation.