Defragging a hard drive can take a long time depending on how big or fast your hard drive is. But, with Auslogic Disk Defrag which is free and easy to use. You have the choice of just defragging fragmented files, or one file to save time . This is useful if you are video editing. If your video file is not fragmented, it won’t take as long to encode your files since your read and write hard drive head does not have to move as much to read your file.
Tutorial for defragging only fragmented files in Auslogic Disk Defrag.
1. Analyze the drive you want to defragment
Analyze the drive you want to defragment
 2. Pick Select All from the file tab’s list.
Pick Select All from the file list
 3. Pick defrag highlighted, and wait for your disk defrag to finish.
Pick defrag highlighted
 Now all your fragmented files are defragmented. You should notice a slight performance gain when opening files.
You also might be interested in reading : Auslogics Free Disk Defrag version 3.1.0.65 Review and Tutorial for speeding up your computers Hard Drives