How to disable the "unrecognized disk" dialog box?

I have a usb drive that is encrypted using truecrypt, I have my mac set up to automatically launch truecrypt when the disk is inserted and ask for the password to mount it, but every time I connect it I get the dialog box "The disk you inserted was not readable by this computer." Is there a way to disable that behavior?

Thanks

 

Yes I can click "ignore" and the dialog box would close. Actually everything works well otherwise, I just want to get rid of the annoying dialog box! I think you are right about the alert being a system one, I initially thought it was a Finder alert, but it popped up even when I inserted the disk after closing Finder.