Once again, OWC provides Mac users the only upgrade solution that delivers higher performance, functionality, and reliability! When first introduced, the MacBook Pro with Retina display base model offered a 256GB SSD configuration with no upgrade option. And current base models start from 128GB to 256GB. Now, instead of being "factory locked", the OWC Aura 6G gives you the freedom to upgrade your capacity to meet your storage needs. Just like other OWC upgrades, we include the installation tools you need plus a free "how-to" video to make this an easy and money-saving DIY upgrade. The OWC Envoy Pro combines elegance and functionality into a sleek, portable external storage solution that complements the design and finish of the MacBook® Pro with Retina display. Its anodized aluminum body protects your drive and data, while its minimal size allows for simple stowing in coat pockets, backpacks or briefcases.