I was researching the possibility of making an M.2 adapter to the 2012 rMBPs, and while doing that I came across this: Mini PCI-E 2 Lane M.2 NGFF 30mm 42mm SSD to Apple 2012 Macbook Retina SSD. Looks like someone beat me to it Don't be fooled by the PCI-E in the name and description, this appears to just be a passive (only a connector and PCB) adapter that can hold an M.2 SSD up to size 2260 (length 60mm). The availability of SATA M.2 2260 SSDs is starting to look good, the prices are not that bad, and the sizes are bound to go up as flash densities grow. The only thing I'm wondering, is if there's enough space for this in the rMBP? This adapter should fit in an iMac without any issues, but is there enough clearance between the rMBP bottom plate and the SSD area? Guess I'll have to take out the bottom plate again, and make some measurements Edit: Well, I ordered one, so we'll find out in a couple if weeks if it fits.