Can You Upgrade the Hard Drive or SSD In Your Mac?
Amazon.com: MCE Technologies 1TB Internal SSD Flash Upgrade for MacBook Pro Retina (Mid 2012 - Early 2013) - Includes USB 3.0 Enclosure for Original Drive & Install Kit! : Electronics
How to install an SSD on a 15-inch Retina MacBook Pro
How to Upgrade Retina MacBook Pro SSD Storage: 13-Inch: EveryMac.com