OWC Aura Pro SSDs provide a noticeable increase in performance over the factory SSDs for all MacBook Pro with Retina display models: Increase capacity up to 16x the 13-inch base models. Increase capacity up to 8x the 15-inch base models. Get write speeds up to 500MB/s, 26% faster than factory original. Get read speeds up to 530MB/s, 8.6% faster than factory original. SLC caching algorithm accelerates burst performance. Global wear leveling algorithm automatically distributes data evenly and manages program/erase count, maximizing SSD lifespan. Data refresh technology ensures data integrity, gradually refreshing data across the SSD over time. ECC protection combines LDPC hard and soft decoding with advanced algorithm to detect and correct errors throughout the entire SSD data path. Advanced security protocols support AES 128/256-bit full-drive encryption. 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.