Originally Posted by knc1
The image shows a trashed FAT-32 file allocation table.
I think the K3 works the same as the other, if you ssh into the Kindle and destroy the file system on mmcblk0p4 with zeros, when the Kindle is next re-booted it will reformat the partition for you.
It would be best if you researched these threads a bit before trying that at home. I am not sure the K3 will auto-reformat the user storage partition.