Jetson AGX Xavier - SSD Card help me

Refer following topic:

@TroyK says
" SAMSUNG 970 EVO M.2 2280 2TB PCIe Gen3" works well with Jetson AGX Xavier.

And from Jetpack 4.4, PCIe Gen4 is supported as well.

Then, I think you may use the firecuda device on your AGX Xavier.