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Disk Defragmenter organizes the data on the drive so each file is stored as one unit rather than as multiple pieces scattered across different areas of the drive. Defragmenting the information stored on the drive can improve hard drive performance.
While Disk Defragmenter is running, do not use your keyboard or mouse because using them may continuously stop and restart the defragmenting process. Also, if you are connected to a network, log off before starting Disk Defragmenter. Network communication may stop the defragmentation process and cause it to start over.
Tip
Because defragmenting a drive may take hours to complete (depending on the size of the drive being defragmented), consider starting the process when you will not need the computer for several hours.
To defragment the hard drive:
1Disconnect your computer from the network.
2Click 
(Start), All Programs, Accessories, System Tools, then click Disk Defragmenter. The Disk Defragmenter dialog box opens.
3Click Defragment now. This process may take hours to complete, depending on the size of the drive being defragmented.
Help
For more information about defragmenting the hard drive, click
Start, then click Help and Support. Type defragmenting in the
Search Help box, then press ENTER.
Backing up files
Backing up files and removing them from the hard drive frees space for new files on the hard drive. It also protects you from losing important information if the hard drive fails or you accidentally delete files.
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