This is an SD card that doesn't show up when I insert it into my Ubuntu (Actually Xubuntu 16.04 LTS). The problem is specific to this SD card, I can insert another card which is fine. Both are micro cards that slot into an adapter before they can fit into the SD card holder on my machine, so I use the same adapter for both micro cards. One works and one doesn't. I figure the problem is the card rather than the OS, the reader or the adapter. When I push the bad card in and
dmesg | tail -20
I get:
[104901.790536] mmc0: cannot verify signal voltage switch
[104902.093191] mmc0: error -110 whilst initialising SD card
[104904.469067] mmc0: card never left busy state
I have looked at tools like testdisk and they all assume the device is detected. For example ls /dev/mmc* gives me no such file or directory. Are there any other options of have I lost the data on my card forever?