Sometimes when I try to disconnect my external USB hard drive, I get a message saying that it can't be removed at this time because it is being used by some other program. Try again later. Actually, I have closed all windows and programs I know about, so something else is locking the hard drive connection. I have heard that there is a utility that identifies the locking culprit. What is this utility and where can I find it?
My PC operating system is Vista.