Used with an external HDD for Mac. All data has been erased. Of course, it's usable and has 2TB of storage. Thank you. Connectivity: It has a USB port, allowing for easy connection to PCs and other devices. It also supports power supply via a DC jack. Included Items: An AC adapter is included, so you can start using it right away. - Color: Black - Connection Port: USB - Power Port: DC Jack - Included Items: AC Adapter Of course, it's usable. 2TB Thank you for viewing.