Yes. Neither removal of old files nor reboot is necessary.
UltraDefrag is open source software, so its code base cannot contain malicious stuff by definition. For extra safety, to ensure that the compiled binaries haven't been infected, we test them all carefully on virustotal.com. Only when all files pass most of the virus scanners we make an official release.
To consolidate free space you can try the full optimization. If it fails to achieve the desired result try one of the following:
The system restore service sometimes tracks file movements. When it exhausts all the disk space reserved for restore points it eliminates elder stuff to release some space for further tracking. Due to this reason we recommend to use backup software instead for serious purposes.
Unset all filters and set the optimizer_file_size_threshold parameter to 15 EB.
When defragmentation algorithms are quite efficient, it's definitely not necessary to know locations of individual files - anyway you'll get your drive optimized quite well. Maybe we'll implement the discussed feature later, but now we prefer to spend more time for the disk optimization algorithm improvements.
Configuration files are easy to edit, even in Windows Notepad.
The progress percentage measures disk space, not number of files. So it advances pretty quickly when the program deals with big files, and slows down significantly when thousands of small files are in the queue.
On FAT disks space gets immediately released after file movements, so it might happen that more files get fully defragmented than initially calculated.
Windows Explorer replaces empty disk names by Local Disk or similar, but UltraDefrag doesn't.
Browsers which do not support tabbed browsing are reusing the same window. This is a limitation of the way a web page is opened from within Explorer.
If your browser supports tabbed browsing open one instance of it before you display the reports. This will open each report in a new tab depending on your browser configuration.
Inspect the file fragmentation reports to find out the reason. Some system configurations are locking files even at boot, which can't be prevented. In some cases free space regions aren't big enough to hold the entire file. You might fix it using the quick optimization which consolidates free space a bit.
Remove the defrag_native entry from the following system registry parameter:
Both programs have similar disk analysis algorithms, but defragmentation is done in different ways. While MyDefrag gives more control over files placement, UltraDefrag uses much simpler algorithms which are faster and easier to use. Additionally UltraDefrag can defragment locked files being launched inside of the Windows boot process.
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