OWC Envoy solves the orphaned SSD problem with style
So you bought a MacBook with a smallish SSD, then you realized that you needed more storage and upgraded to a larger model. Instead of sticking your old stick in a drawer, stick it into the Envoy enclosure.
Source: http://www.zdnet.com/owc-envoy-solves-the-orphaned-ssd-problem-with-style-7000000326/