The G-Technology G-SPEED Studio XL 0G03778 is a Thunderbolt external drive that supports HDDs. It has a storage capacity of 64 TB and comes in black. The product line is G-Drive. However, it does not come with any HDD or HDD caddies! POWER TESTED (PASS). UNIT POWERS ON FLASHES BLUE LIGHTS THEN TURNS OFF. NO CORDS INCLUDED IN PURCHASE! UNIT HAS COSMETIC DAMAGED, SCRATCHES,MARKS, DENTS AND DINGS, LATCH ON DOOR DOES NOT WORK! SEE PICTURES FOR COSMETIC CONDITION.