Are you shooting Jpegs? Apple Store sell a 1 TB drive for 89.00 it works great! I buy several drives for different categories of images Family, Trips...by name Yosemite ex. Never store any images on your MBPRO. I only shoot raw though so my needs might differ. 500 GB ssd internal 16 g on board (not enough) would like to have 32 or 64 g and 1TB SSD, the future is coming!