Auslogics Disk Defrag
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Full user review
This software is awesome for computers with nearly full or full hard drives. Most people will know this, but, do defrag a disk, the software first has to put the data in a temp file, then replace it where it should be. The Windows defragmenter, that comes with every copy of Windows, no matter which version, simply "gives up" when it can't find a place to put the file. Auslogics, on the other hand, like most 3rd party programs, skips the file. I love this software, and on top of this, read my review for its cousin, Auslogics Registry Defrag, and they're about the same.