What is defragmentation?
When Windows computers are used the day to day use of files on the system can cause files to be spread out across disks, known as fragmentation. Stated simply, this is the noncontiguous placement of files on a disk. Using the Defragmentation utility Windows can reorganize files to put like files together on disk and free space near the end. This will reduce disk movement and overall wear and tear on the hard disk.
To defragment your hard disk
1. If the Disk Defragmenter tool is not already running, click Start, point to All Programs, point to Accessories, point to System Tools, and then click Disk Defragmenter.
2. Click the volume that you want to defragment.
3. Click Defragment to begin the operation.
4. Review the progress of the operation in the Defragmentation Display window. Fragmented files on the disk appear in red, contiguous files are blue, and system files are green. The goal is to eliminate most of the red in the window.