Linha de comando
df -h
Exemplo:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 46G 5,5G 38G 13% /
none 4,0K 0 4,0K 0% /sys/fs/cgroup
udev 2,0G 4,0K 2,0G 1% /dev
tmpfs 404M 1,3M 403M 1% /run
none 5,0M 0 5,0M 0% /run/lock
none 2,0G 23M 2,0G 2% /run/shm
none 100M 40K 100M 1% /run/user
/dev/sda6 23G 275M 22G 2% /home
/dev/sda7 289G 63M 274G 1% /data
Desktop
Pesquise em traço por "sistema" e escolha "monitor do sistema":