1. Evaluate hard drive symptoms. A frantic user called a help desk to report that his hard drive did not appear to be working. He explained that the drive produced neither noise nor any indication of obvious activity. In fact, the disk drive activity indicator on the PC was not lighting up. The user fears that worst: a hard drive failure. List as many alternative explanations you can think of for the behavior he describes.

2. Low disk space. A user continually gets the following warning message that his disk space is low: "You are running out of disk space on drive C:" He says he knows his disk space is low, but he doesn't have time to deal with the problem. He would like to know if there is a way to disable the message. Can this warning be disabled? If so, how? Is it advisable to do so?