KDiskFree provides you a graphical overview on your block devices (disks, partitions, floppy-drive...) and their usage. It reads the file /etc/fstab to get information about possibly mounted devices and then periodically calls the df-command to look at actually mounted devices. Unmounted devices are shown in lightgray.
You may invoke KDiskFree ("kcmdf") from your KControlCenter under Information/Block Devices or directly by typing "kdf". "kdf" is more light-weighted in the screen-size used, so if you want to always have a KDiskFree open (as I do) try "kdf" instead of "kcmdf".
KDiskFree was written 1998 by Michael Kropfberger and underlies the terms of GPL.
There are following columns which are shown in KDiskfree:
shows icon for the actual device/mountpoint combination
shows the filename of the listed device
shows the filesystem-type of the listed device (e.g. ext2, msdos, vfat, minix...)
shows the maximum size of the device
shows you, where the device is mounted to
shows you, how many Bytes (rounded to Gigabytes, Megabytes, Kilobytes for convenience) are really available
indicates the percentage of fullness; if this exceeds 95%, the whole device entry is printed out in red and a warning message pops up on the active desktop.
shows you the space-usage in a graphical way (blue = full, white= available)