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 in Windows 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. To do this, follow these steps:

To defragment your hard disk

Open Disk Defragmenter by clicking the Start button Start button icon. In the search box, type Disk Defragmenter, and then, in the list of results, click Disk Defragmenter.

Under Current status, select the disk you want to defragment.

To determine if the disk needs to be defragmented or not, click Analyze disk. Administrator permission required If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.

Once Windows is finished analyzing the disk, you can check the percentage of fragmentation on the disk in the Last Run column. If the number is above 10%, you should defragment the disk.

Click Defragment disk. Administrator permission required If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.

Disk Defragmenter might take from several minutes to a few hours to finish, depending on the size and degree of fragmentation of your hard disk. You can still use your computer during the defragmentation process.

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