In Windows 10 you will no longer need to defragment your HDD with a defrag tool. Windows 10 automatically defragments your HDD in background on scheduled basis when your PC is idle. Also SSDs are trimmed automatically in Windows 10 so you will never have to worry about this kind of maintenance. So when you hear your HDD working and you are not using your PC, don’t worry, probably Windows does a maintenance defragment on your HDD. What you can do to keep your PC in top shape is to run a trusted Junk files and Registry Cleaner like WinSysClean.