truecrypt auto dismount doesn't work

Hi

i' running truecrypt 7.1a under xp
and in my settings i have the what you can see in the screenshot

well i setup to turn off the monitor after 5 minutes and the screensaver after 10 minutes


i left my pc idle for 15 min , and truecypt did not dismount my partition
is the power mode ->stand by ?
why?
what's wrong?

by the way is there a way to auto dismount volumes when i quit truecrypt , i read the manual ,and i did not find an answer
thanks

 

When you returned to the computer after 15 minutes, was the screensaver on?

 

yes
but truecrypt doesn't dismount my volume

 

One possibility is that some Windows application is accessing your Truecrypt partition and your are not aware of it, for example Windows disk defrag, this would mean that data is being read and it won't dismount.