Auslogics Disk Defrag
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Full user review
"Best Degfrag Software"
It works better than Windows Defrag by adding optimization, compacting files is better, and many other things. I have used Smart Defrag and this outperforms it as well. I haven't seen any other alternatives, so this appears to be the best.
Its updating mechanism is not great, and it has cheap ways to make you download other software made by them, but it is worth that by 100 fold.
You are looking at a much better defrag software than you are using currently - even though it has its drawbacks.