Synology Rack Station 4-Bay 4 TB (4 x 1TB ) Network Attached Storage RS409 4100 (Black) Disk Station Manager 2.1: AJAX-Based Management Interface, Remote File Management with a Web Browser, Mail Station add-on with one-step installation, IP camera support, Website Hosting with PHP+MySQL Support, USB Printers Sharing. Basic, JBOD, RAID 0/1/5/6, RAID 5+Spare Support Networking Protocols: CIFS, AFP (3.1), FTP, NFS, Telnet/SSH Internal HDD(1): 4X 1TB Included, and External HDD Interface: 2X USB 2.0 ports, 1X eSATA Port Standard Memory 256MB DDR2 SDRAM