5 Things to Know About the 2014 MacBook Pro 13-Inch SSD
Regarding the MacBook Pro: 1. It uses a proprietary blade SSD The drive connects via a 12+16 pin PCIe 2.0 x4 connector, not a standard M.2 slot.
Standard NVMe drives won’t fit You cannot install a typical M.2 SSD without modification.
Third-party adapters exist Adapters can convert the proprietary slot to accept standard NVMe drives, but require tinkering.
Performance is limited to PCIe 2.0 Even with an adapter, the drive will run at PCIe 2.0 speeds, not the faster PCIe 3.0 or 4.0.
Upgrading is possible but not plug-and-play Expect to research compatibility and potentially deal with firmware quirks if you swap drives.