The developers wanted to create an easy way to add memory to the MacBook Air, without having to rip it open with a Torx screwdriver. The Nifty MiniDrive is an easy-to-use expansion device that allows anyone to quickly and simply increase the available data storage capacity in MacBook computers with SD Card slots, as well as providing a set and forget back-up solution. NiftyDrive – SD Card Based Custom Expansion For MacBook Pro (Now Including Retina) And 13-Inch MacBook Air