Chosen Solution
So i bought a used MBP, but it only has 128GB flash, and the price for an apple 256GB is insane! Can i use a third party m2 ssd from sandisk dor example? Or do i HAVE to buy one specifically from apple? And what speeds can i gain if i buy an external thunderbolt ssd?
Apple uses its own custom blade SSD while its very similar to a M.2 blade SSD sadly it’s not compatible. Here’s the best option for you: OWC SSD upgrades for MacBook Pro with Retina Display 13" & 15" Late 2013, 2014, and 2015
Here is an informative article on MBP Mid 2014 upgrade SSD options. Update (06/25/2016) http://www.everymac.com/systems/apple/ma…
