TarDisk 256GB | Storage Expansion Card for MacBook Pro 15" | R15A (MacBook Retina) Hybrid Drive: Simplest way to increase onboard  MacBook Storage. Flush, seamless integration into SDXC port. Additional storage space is added directly to existing Hard Drive presenting the user with a single, larger, unified volume. Storage: 256GB integrated flash memory with precision UniBody Aluminum enclosure. Speed: 95MB/sec write, 90MB/sec read. Fits: 15" Retina MacBook Pro (Mid 2012, Early 2013) | MacBookPro10,1