The CLI way
The df utility displays the disk space usage on all mounted filesystems. The -T option prints the filesystem type as well. By default, df measures the size in 1K blocks, which could be a little difficult for a desktop user to decipher. Use the -h option to get more understandable output:
$ df -h -T
Filesystem Type Size Used Avail Use% Mounted on
/dev/hda6 ext3 20G 9.3G 9.1G 51% /
/dev/hda7 reiserfs 13G 2.1G 11G 17% /mnt/suse
/dev/sda1 vfat 241M 152M 90M 63% /media/usbdisk
