“Prosoft is excited to release our new Drive Genius External Defrag app, which is a standout tool from the award-winning utility Drive Genius 3,” says Greg Brewer, CEO of Prosoft Engineering. “Drive ...

On a 100GB hard drive that would mean you would want to have at least 10GB free. That's pretty much all I do for my Macs. I've never really found a need to defragment Mac hard drives or do much else ...