Fragmentation makes your hard disk do extra work that can slow down your computer. Removable storage devices such as USB flash drives can also become fragmented. Disk Defragmenter rearranges fragmented data so your disks and drives can work more efficiently. Disk Defragmenter runs on a schedule, but you can also analyze and defragment your disks and drives manually.
1. Open Control Panel.
2. Select “Performance Information and Tools”.
3. Select “Advanced Tools”.
4. Select “Open Disk Defragmenter”.
5. Click “Analyze Disk” button.
6. After completion of Analyze Disk, click “Defragment disk” button.