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does anyone happen to know what the max supported SD CARD size is for the GDEMU as well as what brands to buy that are known to work with said GDEMU?

I buy PNY SD cards, have used 256 and 512GB (Pro Elite). I also have a SanDisk MicroSD 16GB I’ve used for quick experiments.

My GDEMU is a clone btw, 5.15b.

I’ve also used all cards via SD extender.

The maximum size is probably limited by FAT32, which would be 2TB.

The 5.15b I'm using, which is a Clone (silver/metal SD tray), I'm using a 256GB Sandisk Extreme MicroSD. Windows 10 wouldn't let me put it into FAT32, so I used an app to force it, and sure enough, its working quite well!