The OWC ThunderBlade V4 was created for the media professional working in very large files, and needing to manipulate save and transfer them quickly. Efficiency is the key here. The OWC ThunderBlade is the fastest external storage device we have ever tested, and the fastest available to the best of our knowledge. When we can observe speeds up to 2.9GB/s in any data transfer to an external medium, that says all that needs to be said.