When Safely Remove Drive menu is clicked on the external Hard Drive Fedora15 gets stuck!

[Varuna Seneviratna]

When Safely Remove Drive menu is clicked on the external Hard Drive
FD15 gets stuck
I have 350GB external Western Digital USB hard Drive.When I try to
remove it from the system by executing Safely Remove Drive menu the
fedora 15 system gets stuck.The processor starts giving a hum sound
and it goes on even if it is left for half an hour in the stuck
state.The Mouse is not working and everything is halted.

What can be done about this?