Disk Defragmenter is a utility in Microsoft Windows designed to increase access speed by rearranging files stored on a disk to occupy contiguous storage locations, a technique called defragmentation. Defragmenting a disk minimizes head travel, which reduces the time it takes to read files from and write files to the disk.
[1] Beginning with Windows XP, Disk Defragmenter also reduces system startup times.
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Windows 7
Windows 7 is different from the other versions as the user is able to follow the defragmentation percentage as it runs.
[citation needed] It will not defragment a solid-state drive, as SSDs don't require defragmentation and doing so reduces their limited lifespan..
Windows 8
Windows 8 improves solid-state drive drive support by visually identifying the storage type of each volume, and by adding the option to optimize them using TRIM.
This replaces the Defragment option for solid-state drives. The name of
the utility is changed to "Defragment and Optimize Drives".
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