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