The Drobo 5D Model DRDR5-A is an external drive with 5 bays, suitable for storing and accessing a large amount of data. The black color adds a sleek and professional look to the device. This model does not come with a power supply, making it ideal for users who already have a suitable power supply set up. Perfect for those looking for a reliable and efficient storage solution for their computer or network system.// please read // this units are preowned tested just to power on / unsure if they will operate fully or not reasons why selling for parts /