Apple Compatible M.2 SSD For MacBook Pro-Air Adapters
With a combination of the right M.2 adapter and the proper SSD blade you MIGHT be able to cobble a working solution that's compatible with your Mac laptop at a lower price or for better performance than you'd get with OWC's or Transcend's custom-made solid-state modules for Apple laptops.
Might is the key word here. As I look at the various M.2 SSD adapter cards (whether they're PCIe or SATA III based) - It quickly becomes very complicated and confusing. Exactly which Year / Models of MacBook? For Pro or Air? PCI or SATA? X2 or X4 speed PCIe? What Brands / Part #'s of Samsung, Kingston,Toshiba, SanDisk, etc. SSD modules are or aren't supported? What size / length? Are they bootable with Mac OSX as a startup disk or not?
As I researched the MacBook compatible solid-state drive adapter products and market - even I became utterly confused by many of the often very 'Chinese-y' descriptions which fail to clarify things in a way the average Apple consumer could even comprehend:
"About MacBook Air SSD interface standard: 1: 2010 and 2011 version MacBook Air SSD is 6+12 pin, only one side have contact, size is 109 mm*24 mm. It's SATA interface. 2: 2012 version MacBook Air SSD is 7+17 pin, size is 109 mm*24 mm. 2012 version MacBook Pro SSD is 7+17 pin, size is 89 mm*33 mm. It's SATA interface. 3: 2013 and 2014 and 2015 version MacBook Air SSD is both side have contact, one side is 16+12 pin, the other side is 11+14 pin, size is 89 mm*24 mm. It's PCIe X4 interface. 4: 2013 and 2014 and 2015 version MacBook Pro SSD is both side have contact, one side is 16+12 pin, the other side is 11+14 pin, size is 89 mm*33 mm. It's PCIe X4 interface."
All things considered, this market is just too deep and complex and filled with too many variables for me to cover well. True hardware upgrade nerds groove on figuring all these specifics out and performing the upgrade themselves. But the average Mac user just wants a simple, affordable solution. For them I simply recommend whatever off the shelf, direct plug in Apple spec modules they can order from Transcend or OWC and leave the adapter / retrofit M.2 SSD Apple solutions to the kind of guys that prefer cheaper DIY complexity over retail solutions.