The Disk Defragmenter feature has been renamed as "Optimize Drives" under Windows
To defragment your hard drive under Windows 8:
Click on the Charms Bar > Optimize Drives
The Optimize Drives dialog shall open, displaying the list of drives.
Select the drive of your choice (Note that: the Current status field will give you the % fragmented) and click on *Optimize.
The defragmentation process will start.
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