This new BUSlink pocket size hard drive provides the most popular interfaces: eSATA & USB 3.0.- all in a compact 2.5" form factor enclosure. It draws power from the USB bus even when using eSATA; it does not require a power adapter. Not only lightweight and portable, USB 3.0 interface also means that the drive is capable of transferring files at the speed of up to 5 Gbps. Plug and play installation means you can be using the drive within minutes after taking it out of the box. BUSlink USB 3.0 Disk-On-The-Go Slim Drive is also backward compatible with USB 2.0, so you don"t need to worry about not being able to use it with USB 2.0 system. BUSlink USB 3.0 Slim Drive is perfect for anybody that is looking for lightweight, fast, and reliable storage solution.