[scorey]

I had this happen. I managed to resolve it by formatting the drive with a new partition table in gparted.

The problem I have is that nothing recognizes the cards. I can't format with a new partition table in gparted, because gparted doesn't see any card. Nothing sees these two cards, not on Windows Linux MacOS. Not different card readers. Other cards I have are seen fine. I could use gparted with those if I wanted. But for these two cards that I used in Tangara, they are essentially non-existent. They are merely plastic wafers devoid of any useful features. I'm not sure how else to explain that no software tools can be used on these cards since any software tools require their underlying system to recognize the card's existence. I have not found any hardware out of all that I've tried (see above for the approaches I've taken) that actually reports that these two cards do exist. I'm still trying to set up a toolchain to poke at them at a hardware level to investigate.