Summary: I originally used a Seagate 500GB PC/MAC External-HD, but after ordering this Samsung P3 1TB, I decided to give the Seagate to my younger sibling as she was starting college. Everything was fine with the P3 until (literally-no exaggeration) it bumped into the arm-holders of my desk-chair. It had a thick, comfy case covering it, yet it still would never again register with my PC.
Summary: I have rewritten this review.............. The Samsung (owned by Seagate) P3 drive is supplied with a USB 3 cable. Connecting the drive to my laptop (USB 2 port) with the Samsung P3 cable results in a "not recognised" message - very frustrating. Connecting the P3 drive with the cable supplied with the Seagate Backup Plus 1TB drive enables the Samsung drive to work perfectly. On closer inspection, the Samsung P3 USB 3 cable is much thicker than the Seagate USB 3 cable.