M.2 SSD not visible when connected via PCI-e board

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@tophneal @dukla2000 Thank you both for the replies. You're right, the SSD is SATA. I thought if it had the right form factor, it would work.

Is there an adaptor for the Rockpro that will allow me to use this drive? Or do I need to get a different SSD?

Thanks again

I'm not 100% sure but this looks very similar in size to the m.2 NVMe card. It also has a second regular SATA controller. Would probably try to find out about the controller chip and whether is is supported by the linux kernel (to its credit, the kernel covers a fantastic array of drive controllers).