By default, the Windows Optimize Drives tool (and other various disk defragmenter utilities) will completely ignore files that cannot be defragmented, and fragments that are larger than 64 MBs, whereas a Defraggler “Defrag” will attempt to process all fragmentation, regardless of whether or not defragmentation is possible, and regardless of fragment size.
While this makes our software much more accurate and thorough than other utilities are, it can also greatly extend the amount of time it takes to perform the operation.
This isn’t as thorough as a full defrag because it will only process files with fragments smaller than 50 MBs in size; small fragments are what have the most impact on drive performance, therefore this is an effective, but quick way to give your PC a boost.
Note: It is not abnormal to see leftover fragmentation after performing a Quick Defrag because it does not defragment fragments that are over 50 MBs in size, which have a minimal performance impact.
This option will reduce your drive’s susceptibility for fragmentation.
This is because over time, the drive’s free space will exist in scattered areas across the drive, rather than in a contiguous block, which can lead to the drive accumulating more fragmentation than it would when compared to if there was an existing contiguous block of free disk space available to store new data.
(i.e. whenever a new file needs to be written, there may not be a large enough block of contiguous free space to fit all of the file data into, forcing the hard drive controller to scatter the file data across several areas of the drive, resulting in fragmentation.
More information about the options Defraggler offers for defragging freespace can be found at https://www.ccleaner.com/docs/defraggler/using-defraggler/defragmenting-free-space-on-a-drive
This is designed for Solid State Drives, aka SSDs. Specifically, it will initiate the TRIM operation in Windows, or perform a zero-filling technique, which improves SSD performance.
More detailed information about the Optimize option for SSDs can be found at in our article on Defraggler and SSDs.
Note: Regardless of what type of defrag you perform, Defraggler will report all fragmentation, while Windows Disk Defragmenter and other various utilities will not report on fragmentation that cannot be defragged. As a result of this, you may discover that other defrag utilities report zero fragmentation at a time when our software more accurately reports on exactly what is fragmented.
Note 2: Defragmentation is not necessary unless and until the drive has accumulated at least 10% of fragmentation because when below this threshold, there is not any noticeable impact on performance. Furthermore, and because of how new fragmentation is continuously accumulated via new files that are written to drive in non-contiguous blocks of space, it is not feasible to maintain a perfectly defragmented drive; oftentimes this is unobtainable. Further discussion can be found at https://www.lifewire.com/how-often-should-you-defrag-3976922