This grey device is very reasonable in price you can pick which transfer data with 5Gbps speed and USB interface 3.0.

This is portable and runs straight with good speed and MAC and OS Windows. This best cheap 500GB external hard drive USB 3.0 with super speed is best for transfer files and is very lightweight. Definitely recommend! Sonnics 500GB Hard Drive Good transfer speeds, quick setup, and very reliable. My experience with using the drive I was sent has been great. Some reviewers are complaining that the drive stopped working after it was dropped… This is the case with any hard disk drive.

Plug and play do all the setup for you so it pretty much works right out of the box! At just under 5″ x 3.75″, the drive is pocket-sized making it easy to take with you anywhere. Customer’s Review from Amazon: The drive works great and couldn’t be easier to use.