This 8TB (4x2TB) Synology RackStation RS812 4-Bay NAS Server with SATA Hard Drives Kit from B&H consists of a network attached storage server from Synology and four 3.5" SATA HDDs. Each of the 7200rpm drives has a data storage capacity of 2TB, for a system total of 8TB. The server is equipped with an eSATA port, as well as dual USB 2.0 ports. The drives utilize the SATA III 6Gb/s interface. The RackStation's average data transfer rates are 109.7MB/s for read and 50.6MB/s for write under a RAID 5 configuration in a Windows environment.