Synology Disk Station 4-Bay 4 TB (4 x 1 TB) Network Attached Storage DS409 4100 (Black) AJAX-Based Management Interface, Remote File Management with a Web Browser, Mail Station add-on with one-step installation High Speed: 41+ MB/Sec RAID 5 Write and 57+ MB/Sec RAID 5 Read 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 256 MB DDR2 SDRAM