04-28-2011 06:49 PM
Yes and no.
My understanding of real time defrag is that it runs in the background whenever it is needed.
At a certain point, the disk is defragmented so it would not then keep running or defragmenting (although it would ideally be available should a file become fragmented).
Here is a link for more info on this:
If this is done correctly, there would be no resource hit on the computer while real time defrag was running; it would be truly transparent, as described in the article above.