I have a SD-Card and it doesn't work anymore. If I enter
dmesg, this console will show this:
[ 646.467407] mmc0: new SD card at address d555 [ 646.468578] mmcblk0: mmc0:d555 SD032 30.6 MiB [ 646.474167] mmcblk0: unknown partition table
It shows, that the card has 30.6 MiB, but it has 32 GB. I cannot create a partition and with testdisk could not repair this. testdisk "thinks" it the card has only 972 cylinders.
The damage happens, after I have written a Raspbian image on the card.