WD 4TB 2.5 inch HDD EXT My Book Thunderbolt Duo Desktop RAID External Hard Drive – Thunderbolt | WDBUTV0040JSL

Storage Number of Hard Drives Supported: 2 Total Hard Drive Capacity Installed: 4 TB Controllers RAID Levels: 0, 1, JBOD I/O Expansions Number of Total Expansion Bays: 2 Interfaces/Ports Host Interface: Thunderbolt Physical Characteristics Form Factor: External Height: 6.5" Width: 3.9" Depth: 6.2" Weight (Approximate): 4.74 lb Miscellaneous Green Compliant: Yes Green Compliance Certificate/Authority: RoHS, WEEE