defragging does not open up space...
it dosnt even "clean" it.
Brief information on Defragging:It's related to the performance of data harddrive read/write speeds... Opening files and such.
Defragmentation is useless for two of my Harddrives which are SSDS due to the way they work.
If I remember correctly for the defragmenter in Windows. Red is fragmented files and should give you an idea as to when you should defragment.
Knowledge from personal experience.