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Question:

What suggestions can you make to help speed up his hard drive when they complain that the disk drive appears to be running extremely slowly and it is beginning to affect the system speed. He checked and the hard drive is less than half full?

A Defragment of the hard drive.
Explaination

It's possible that the files on his hard disk have been fragmented. Unless the user is using a solid-state drive (SSD), which should never be defragmented, the user should defragment the disk.