A newer version of Smart Defrag is available.Or, Learn More About Smart Defrag
Full user review
"Seems to do what it claims"
Easy installation, simple setup.
Seems to run slowly when defragmenting large capacity external drives.
It took over 9 hours to defrag a 1.5TB external drive holding mainly music and video files but at the end there was a noticeable improvement in performance. Recommended -- but be patient with it.