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I went with FAT32 since I have other devices that don't like ExFAT. It's a hassle getting larger cards to format FAT32, that's why I went with Rufus. Right now the problem is that the cards aren't recognized period. I've tried under my Windows machines, Linux machines, embedded devices, and one MacOS machine, all different readers. They don't show up. They are no more. They have ceased to be, bereft of life, they rest in peace. Perhaps they are ex-SD-cards, but I hope they can be resurrected.

It's been a while since I've done any ESP32 development (going on 8 years now, I think) but I was going to try getting in there and reading any SD status directly to see what's there--or isn't there. Right now the only SD reader I have that I can poke around with like that is in Tangara. Do you have any tips for that?

You'd likely need to dive into esp_driver_sdspi for that because file reading is abstracted behind the C library file reading functions. There are some logs in esP-driver_sdspi you can enable, but when I tried enabling them, the logging slowed down the Tangara enough on its own to cause problems.

Alternatively you can try the Rust firmware I started which so far all it does is read a file from the SD card in a loop.