How do I check how much free space is on my usb? I don't see how I can do this, although I can access the usb stick's files when I insert it through Dolphin. Preferably a UI option, not command line.
You should look in the lower right corner of the Dolphin screen after you've inserted the USB stick. In the example, my USB stick has 3.7 GiB free.
If you don't see anything like that, open Dolphin, press Ctrl+Shift+, to bring up
Dolphin Preferences. In there, click on
General in the left pane and then on the
Status Bar tab and ensure that
Show Space Information is active.
Dolphin also allows you to examine the USB stick's properties. With the device inserted, move up to
root and then to
media. There you'll see, possibly among other folders, a folder with your username. Open that: you should see a folder bearing your USB stick's name (as seen by Dolphin). Right-click on that folder to get the window shown below. The
General tab will show you what you want.
And, I know you asked for a route using the graphical interface but you can get the basic information, somewhat quicker, using the command line. See the last line in the output below on running
dkb@kububb:~$ df -h Filesystem Size Used Avail Use% Mounted on udev 3.9G 0 3.9G 0% /dev tmpfs 785M 1.6M 784M 1% /run /dev/sda6 288G 26G 248G 10% / tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/sda1 496M 34M 463M 7% /boot/efi tmpfs 785M 0 785M 0% /run/user/118 tmpfs 785M 4.0K 785M 1% /run/user/1000 tmpfs 785M 12K 785M 1% /run/user/1001 /dev/sdb1 466G 196G 271G 43% /media/dkb/TOSHIBA EXT