Can you connect a USB Pen in the computer and then type this on the terminal
and paste here the output before and after connecting the device. Like this:
Before:
[aliasbody@BodyMSI ~]$ ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda3
After:
[aliasbody@BodyMSI ~]$ ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sdb /dev/sdb1
And after that could you also post here the kernel you are using.
Just type this and paste here the output :
uname -r
It will show something like this:
3.6.3-1-LIBRE