Transcend USB 3.0 External Hard Drive from Transcend combines a 4TB(4000GB) storage capacity with a USB 3.0 interface, 256-bit AES file encryption, and military-grade shock resistance. The internal 2.5″ hard drive receives further protection from a suspension system, while a one-touch auto-backup button helps to create a second copy of your data and a quick reconnect button re-enables the removed hard drive without needing to remove and reinsert the USB cable. Power is provided via the USB bus, and compatible operating systems include Windows, Mac, and Linux.