Four observations:

1. The fsck.exfat command worked. So obviously the mkfs command and kernel 
aren't seeing the wrong state of the card's physical lock switch. It sounds 
like a weird bug that it then can't be mounted. Maybe try an explicit mount -t 
without -o rw. I'd think if it's a bug it'd have been found about an hour later 
though, pretty significant bug if it's a bug.


2.

Aug 25 20:24:27 localhost.localdomain kernel: mmc0: new ultra high speed SDR50 
SDHC card at address 0001

SDHC cards are supposed to be formatted FAT32. And SDXC is supposed to be 
formatted exFAT. That's per the SD Card specs anyway, which is how any camera 
supporting these types of cards should work.


3.

Last, and actually most important, practically obsoleting the above two 
observations: this card is being used in a camera? The camera must be used to 
format it. That's what the camera manufacturer and the SD card manufacturer 
will tell you. The interoperability is *so bad* with SD cards, that they will 
both tell you that corruption and even camera malfunction is expected if you 
don't format the card in-camera.

Further, it's well understood by pros and the amateur (the classic connotation 
of the word implies someone more serious about their interest than even a pro) 
that the camera image delete option shouldn't be used. Take your shots, fill up 
the card or get to a good break point to swap cards. When sucking the images 
off the card with a computer, suck all of them off, back them up, then go 
through and throw away the junk photos you don't want. Reformat the card in the 
camera.


4.

Best quote about SD Cards ever: "You aren't storing your data, you're storing a 
probabilistic approximation of your data."
https://www.youtube.com/watch?v=CPEzLNh5YIo
Quote is somewhere around 3m30s; including the point that flash memory is 
unreliable, and lots of other cool observations. I don't know why these things 
are called secure digital (SD) after watching this.


Chris Murphy
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