Like other programs by Piriform (Recuva and CCleaner for example), Defraggler is a stable useful freeware application which does a nice job at defragmenting your hard drive(s).
One of things that puts Defraggler above its competitors is that you can actually defragment a certain folder on your hard drive as opposed to waiting an hour to defrag the entire drive.
On the other hand, Defraggler also defrags and entire hard drive nicely. You can also perform a hard drive analysis to see whether or not the drive indeed requires defragmentation -- Defraggler will let you know in any case.
Another cool thing about this program is its feature which allows you to analyze a certain file (like a large file, for example) which determines whether it is fragmented or not. If it is, it may actually be slowing your system down.
At the end of the day, Defraggler is an excellent program and highly recommended if you'd like to make sure your system is running a peak performance without file fragmentation.
Installation note: When you run the setup for this program, you may be asked to install the Google Toolbar. To avoid installing adware on your system, we recommend deselecting the optional addon which is checked by default.Defraggler features and highlights:
Defraggler is licensed as Freeware for Windows (32-bit and 64-bit) operating system / platform from hard drive defrag software without restrictions. Defraggler 2.21.993 is available to all software users as a free download (Freeware).
Compatibility with this drive defragmentation software may vary, but will generally run fine under Microsoft Windows 10, 8, 8.1, 7, Vista and XP on either a 32-bit or 64-bit setup. A separate x64 version of Defraggler may be available from Piriform.
We have tested Defraggler 2.21.993 against malware with several different programs. Please review the test results. We have not certified this program as clean. [Read more]