Defraggler is a freemium defragmentation utility developed by Piriform Software, which can defragment individual files or groups of files on computer memory systems.

[4] It can also be installed as a portable application on a USB flash drive.

Defragmentation of RAID disks is also supported, although no details are supplied.

[6] In Lifehacker's Hive Five for Best Disk Defragmenter, Defraggler received first place.

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