You might’ve noticed that Snap apps creates a loopback disk used for mounting the image file for the app. This clutters the UI of fdisk, df and other disk related tools.
fdisk -l could show you this:
Since most regular drives starts as
/dev/sd* you could simply grep the output:
sudo fdisk -l | grep "Disk /dev/sd"
Or even better, use
sudo fdisk -l | grep -v "loop". The -v parameter means grep reverts the keyword so anything containing “loop” will not be shown.
df -h | grep -v loop
grep: You only need to add quotation marks around the keyword if it’s a string which contains spaces. Single words don’t need quotes.
You can also pipe it several times through grep, like this:
sudo df -h | grep -v loop | grep -v tmp
Or take a look at this Stackoverflow thread for more grep variants