[SOLVED] Everything locked in thumb drive??

[Monkeyman]

After the first command, I get this:

brw-rw---- 1 root disk 8, 81 Mar 25 10:57 /dev/sdf1  (If it matters, the "/dev/sdf1" is highlighted in yellow.  No idea what that means.)

I get absolutely nothing after the "ls -l" command.  Used the same letter case, etc as what showed up after the "lsblk" command.

EDIT: I have another thumb drive (very slow USB 2.0) that works fine so it's not the USB port.