1. Open Windows Explorer
  2. Right-click on the drive letter to be defragmented
  3. Select Properties
  4. Select the Tools tab
  5. Click Defragment Now

Note: Disable any screen savers before starting this process. If the drive is large or has not been defragmented in a long time the defragment process may take a long time.

As files are added to and deleted from the computer's hard disk, the amount of continuous available space on the hard disk decreases. If a file saved to the hard disk is larger than the largest available block of space, the computer splits the file among sectors of the hard disk. When files are thus "fragmented," the computer must search more of the hard disk each time the file is accessed to find all of the file's parts. It is the longer search which slows response time.