flowrider
macrumors 604
One other thing to be aware of is that the Crucial firmware updater (standalone boot) only recognizes the standard four ports. You cannot flash drives connected to add-on controllers, even if they are bootable.
The MX200 is now at MU02, but still shipped with MU01 a month ago.
Actually AKAIK, that's an issue with any make of 2.5" SSD. Here's a post of mine from over two years ago related to the Samsung SSD and Apricorn x2:
https://forums.macrumors.com/threads/samsung-ssd-firmware-with-an-apricorn-velocity-x2-card.1615759/
Lou