Apple has used several different and incompatible slim SSD types in recent
years. Now that they have finally adopted NVMe in the cheesegrater that costs
as much as a car, they're still locking the buyer in. The computer comes with
two modules installed but their serial numbers are programmed into the firmware
so they can only be replaced for failure or upgraded by Apple, and the computer
won't boot if they're removed.
On Friday, July 3, 2020, 7:24:57 AM MDT, Thaddeus Waldner
<[email protected]> wrote:
Be aware that M.2 is a socket spec that includes both SATA and NVMe type
devices.
https://www.atpinc.com/blog/what-is-m.2-M-B-BM-key-socket-3
Added to that, Apple began using PCIe drives before the NVMe standard was
established, so there’s another socket to be confused about if you run Mac.
>
> Fast forward to the year 2020... Today we don't use SSDs that are made to
> look like HDD and are put inside of a box with a SATA interface. That hack
> was a transitional technique for retrofitting SSD into older computers.
> The box is mostly filled with air and the SATA interface is dead-dog-slow
> compared to PCIe. A modern SSD comes on an M2 size card and plugs directly
> into the PCIe bus and does not even try to pretend it is a SATA Hard Drive.
> If you are buying new storage you want a PCIe interface M.2 forms factor
> SSD.
> https://en.wikipedia.org/wiki/M.2
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