HDD External 2.5" Toshiba Canvio Basic 4TB USB 3.0, nterface: USB 3.0 (backwards compatible with USB 2.0), Transfer Rate2:Up to 5 Gb/s3, System Requirements4, Formatted NTFS for Microsoft® Windows® 10, Windows® 8.1, Windows® 7, Requires reformatting for Mac OS v10.12 /OS X v10.11 / v10.10, Available USB 2.0 or USB 3.0 Port