andersdk wrote: ↑
Tue Dec 03, 2019 2:01 am
Running Linux you can try parted from a terminal or gparted from your desktop.
That would give you full access to wipe partitions and reformat your SD card.
You MUST do that before re-imaging the Debian Buster image.
When you write Raspbian images to your SD card there is NO NEED to do anything to the card prior to writing. The image file overwrites everything on the card including any existing partitions and formatting.
If, however, you are putting NOOBS on the card (or PINN, except for the image version), you do need to reformat the card in FAT32 format first.
As to the problem, it does sound like the card has developed a fault.
The presence of a "SETTINGS" area is odd for an Image based install though. That sounds like a NOOBS partition.
Running Linux I usually use dd to write to my cards, but you need to be very careful that you get the correct output device.