The tower is equipped with 8 drives 4TB or 32TB in total. Disc recognized independently windows as I wanted (JBOD). Test RAID 5 raid 0 and raid 50 functional but useless for me. USB 3 speed for writing 120MB / s read speed 130MB / s (Less fast eSATA). Very quiet and simple product to implement. Perfect for my part, I highly recommend.