First and Only Complete Storage Upgrade 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 the in include the installation tools you need plus a free 'how-to' video to make this an easy and money-saving DIY upgrade.