Sans Digital Multiplier Storage Enclosure (ST-SAN-TR4M6G) New 6G Port Multiplier PM storage, with 6G RAID controller, fully support 6G hard drives Bundled with RR642 RAID controller card, PCIe 2.0 x4, for over 300MB/s RAID 5 performance. Dual-port eSATA 6Gb/s PCIe 2.0 x4 RAID controller supports up to 2 units or 8 hard drives in a single or multiple RAID array. Backward compatible with PCIe 1.0. Supports RAID 0, 1, 10, 5, 5+ spare, spanning and JBOD. Supports online expansion to expand capacity without the need to recreate the RAID volume and erase the existing data. Built-in real time hard drive health monitoring, remote RAID management and e-mail notification for critical events. Supports PC, Linux and MAC OS, including Windows 8, Windows Server 2012 and MAC OS 10.6 or up.