The G-Technology 4TB G-Raid Storage System with Removable Drive is a high-performance removable dual-drive storage system. Configurable in RAID 0, RAID 1, or JBOD, G-RAID features USB 3.0, eSATA and FireWire for ultimate flexibility. G-RAID ships with two 2TB removable 7200RPM hard drives, complete in an all-aluminum enclosure.