Installing Catalina on a Thinkpad P15 (Xeon W-10855M, Comet Lake). I followed Dortania's Github guide to create an installer on a 64GB PNY USB stick, with relevant kexts and drivers for my hardware.
I'm trying to install onto a 500GB Seagate external USB SSD. When I boot my USB install stick, I can get to Disk Utility, but Disk Utility can't see my Seagate SSD. Disk Utility can see the PNY stick. What's going on? I suspect something is wrong with how my EFI is handling USB but I'm not sure where to start.
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