mounting problem
 

:newbie:

I have a 1tb external USB hard drive.
i am running ubuntu 10.04 'lucid lynx' whenever i connect the external USB hard drive, it is connected correctly

but when my screensaver get turn on or i disconnect my external USB hard drive and reconnect it.

computer answers 'unable to mount external USB hard drive'
also when i tried to mount the external USB hard drive right clicking it gives error

what is the exact error message?
what is the filesystem used on your drive?