Monoprice 4-Bay NAS Enclosure Up-To 16TB (4 x 4TB) with RAID, DLNA (111157) It has a built-in 150 watt power supply so it can easily handle up to four 3 It supports the Samba AFP NFS FTP HTTP and iscsi protocols The drives are installed using hot-swap trays so you can replace a defective drive without having to take the system down