The Axiom 2.5" USB 3.0 Mobile-D Series external hard drives connect to your computer through any available USB 3.0 port. They are BUS powered so no extra power cords are needed. Transfer data up to 3 times faster than USB 2.0. The 2.5" Mobile-D Series external hard drives are constructed from durable aluminum, to ensure heat dissipation to protect your drive from overheating. It's the perfect solution for mobile data transfers or data backup.