Hmm, I've never defragged my lappy either. Let's check... Oh nevermind, apparently Windows 10 has a feature that defragments your drives automatically every week... That's useful.
All Windows OSs after 95 have it, thing is, I've turned mine on because it messes up the bootup and forgott to defrag for 3 years...
Really, why? It does nothing other than slow down those files... Unless you did it so that new files won't be fraged when moved to the HDD...
I wouldn't defrag a 2 TB drive that has less then 10% free disk space. It puts unneeded strain on the assembly.
Oh nevermind, apparently Windows 10 has a feature that defragments your drives automatically every week... That's useful.