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I wonder if your files are at a different location than /dev/sdc1. Precisely how did you back them up, and how did you try to get them back from the flash drive?
I would check for more information in the kernel message buffer, which you access in a terminal window with the dmesg command. This command will list everything in the buffer, hundreds of lines. Better generate the error again, then look at the latest messages in the buffer: dmesg | tail -n20 shows the last 20 lines.
EDIT: syg00's recommendation is to use the journalctl command to check the system journal. You could filter for messages that include /dev/sdc: journalctl | grep sdc.
There are tools that allow you to analyze what is on a drive. If you prefer the GUI, use gparted (the graphical version of the GNU partition editor). It might be on your laptop already, but you may have to install it.
If you are interested in using the command line, tools to try are lsblk to list all block devices (that is, storage devices), the non-graphical version of the partition editor parted, and the mount command.
In the future, I would not rely on flash drives for backing up absolutely crucial data. Better options: A cloud service if you are not that concerned about privacy and security, a proper hard disk or solid state disk (USB is fine), a second computer at home. You may actually want to save them to more than one destination.
Last edited by berndbausch; 10-17-2019 at 06:56 PM.
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