Western Digital WD 2TB Elements Portable Hard Disk Drive, USB 3.0, Compatible with PC, PS4 and Xbox, External HDD (WDBHDW0020BBK-EESN)

Seagate Expansion 2TB External HDD – USB 3.0 for Windows and Mac with 3 yr Data Recovery Services, Portable Hard Drive (STKM2000400)

Western Digital WD 1TB My Passport Portable Hard Disk Drive, USB 3.0 with  Automatic Backup, 256 Bit AES Hardware Encryption,Password Protection,Compatible with Windows and Mac, External HDD-Black