Do Framework's first party storage expansion cards act as flashdrives?

[Fraoch]

I don’t have one yet - Santa might bring one to me - but I’m certain the answer is yes.

Storage Expansion Cards

[2 storage expansion cards] Continuing our series of technical deep dives on the Framework Laptop, today we’re sharing more about Storage Expansion Cards. The Expansion Card system in the Framework Laptop lets you choose exactly the ports you want and which side you want them on. This lets you slot in any combination of USB-C, USB-A, HDMI, DisplayPort, MicroSD, and more seamlessly, rather than needing to carry around external adapters. Expansion Cards let you customize the capabilities and per…

It uses a Phison U17 flash controller.

https://www.phison.com/en/u17-u18

It’s a USB 3.2 Gen 2x1 USB flash controller and would present as a USB flash drive to the OS.