No specification as to the type or degree of defragmentation
I ignore Windows Defrag, and use two freeware products for this; Auslogic and Ultimate Defrag. Windows Defrag doesn't allow me to control or know what it does, it just does something that consumes a lot of time and resources.
Ultimate Defrag allows me to re-set the hard disc architecture and file distribution to my liking, and can be set to do a boot defrag on start up to clean out the accumulated junk in the boot cache and registry; and pack it efficiently. This will speed start up more than the vast majority of packaged start up fixers, without requiring the removal or delay of programs you want in start up to achieve an effect. It is "relatively" safe, but it can really screw things up if you pick the wrong options. Until you get to know Ultimate Defrag, set a good restore point and be ready to use it. The "defragmented files only" (or "lite") defrag setting is pretty good, too; and useful for initiating the boot defrag, which is quite fast. It's not the boot defrag that causes crashes, at least not in my experience. Ultimate Defrag also allows for manual adjustment of system resource allocation, should it get too invasive in wisely restrained use of other tasks.
Auslogic is the defrag most people will ever need. The lite option is as fast as it gets for what it does, and it allows you to set it to delete unnecessary files first before defragging. It doesn't tell what files it picks, but I've never missed them. By the time it is queued up, the files are probably gone anyway. If you pick defrag with optimization, it really packs it down without confusing or delaying explorer; and blows Windows defrag out of the water in speed and effect for the long, thorough one. It just doesn't let you decide where the data resides on the disk, but it will preserve the architecture already established. It also has a defrag on the go option that automatically puts some things back in the tool box instead of leaving them on the workbench. I haven't a need to use this, and can't claim as to it's value.
I do a lite defrag (after an additional manual scan and thorough cleaning) a few times a week, mostly to kill hidden worms in unlabeled sectors; and to frustrate big brother (however impotent and futile). It doesn't cause the wear and tear on the hard drive that a good wipe or a big defrag does when over used. I do a thorough defrag about once a month or so for speed and efficiency, depending on how my computer is acting; and deciding if repacking or resetting is in order. I haven't done a wipe, or bombed free space in years.
Why schedule defragmentation with these options? The lite ones usually take a lot less than 5 minutes (depending mostly on diligence and computer use), and the big ones can be started before going to bed or to town.
One additional disclaimer: the first defrag is normally longer than it will end up being in future ones, until the program gets used to your system and you get used to the program. It gets faster after that, usually a lot faster.
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