1TB OWC Aura Pro 6G SSD Envoy Pro Upgrade Kit for 2012-2013 MacBook Pro with Retina Display by OWC

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 Pro 6G gives you the freedom to upgrade your capacity to meet your storage needs. Just like other OWC upgrades, we include a free 'how-to' video to make this an easy and money-saving DIY upgrade.

Ultra-portable, bus-powered external storage solution designed to complement the MacBook Pro with Retina display
 
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.

The USB 3.0 interface offers speedy transfer rates of up to 500MB/s and the Envoy Pro requires no AC power.