I have an ipod 3rd gen (original) with 256GB SDXC card and rockbox 3.13 installed. It has a DOS partition table. The second partition is formatted fat-32. It had been working (though it gives me trouble off and on).
I tried using rockbox's file manager to move some audio files and rename some directories. This failed horribly, resulting in all the moved files having 0 bytes. I put the SD card in my computer (running Linux), recovered the original files, copied some more on, and put it back into the player. The only files I touched were in /Music and /Playlists.
Now, when I start the player, it sits at the apple icon longer than usual, then shows the !folder icon before rebooting. The cycle repeats. If I hold the two outside buttons for disk mode, it instead hangs at the apple icon, presumably until the battery dies.
I can still access the card on my computer. fsck found (and fixed) a dirty bit, but nothing else.
How can I get this player to work again?