There is a bad behaviour of diskdrake (and also a bad message) when diskdrake is started and when a device is no more available through supermount.
for example : plug and switch on a usb device so that a dynamic icon appears on the desktop, then switch off and unplug this device. (maybe it is enough to `ls` a floppy and remove it). Start diskdrake. A message appears : "I can't read the partition table (...) Do you agree to loose all the partitions?" This message is bad because it make me think that I will lose all data. The message is not clear about what will be done, and whether the changes may occur on a single device or not. But this message should even not appear, because since the real device is not there, the corresponding /dev entry should not be there.