Disk usage applet incorrect

[Derek Fountain <fountai hursley ibm com>]

I'm running Helix GNOME on SuSE-6.4 on a dual boot laptop.
According to df my disk usage is currently:

> df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda6             9.6G  4.4G  4.8G  48% /
/dev/hda2              14M  2.7M   11M  20% /boot
/dev/hda1             6.8G  1.4G  5.4G  21% /windows/C

which looks about right. But according to the
diskusage_applet:

/          av:784.699MB
/boot      av:10.828MB
/windows/C av:1.383GB

Is the applet broken?