I have a user whose hard drive is nearing full. As a temporary measure, I had him download Scanner to see if he could find something big to delete. But when he ran it, it claimed that only about half his disk space was used. I'm disinclined to believe that there's a huge bug in Scanner, but, rather, that there is some directory somewhere that is inaccessible to the user account that the program is being run as.

Does anyone know of a utility that would help me find where that directory or those directories might be?