Worse is when posters reply to a dormant thread with incorrect information because they didn't bother to read through the thread first.it is hard to explain something, when people are not listening, but keep repeating the same thing over and over.
The problem with dropping the mic is the thread might be left dangling with misinformation presented as the last word. And that does a disservice to future readers.
@Panny - sadly, everything you said was wrong which you would have realized had you read through this "dormant" thread before dredging it up 2 weeks after the last reply.
As roger_m correctly noted (along with others again and again), Windows automatically defrags the hard drives once a week. Therefore, it is unnecessary for users to manually defrag once a month.
Adding and saving files frequently or not frequently has very little to do with fragmentation. The amount of free disk space available on the drive is a much more significant factor. After that, it is modifying existing files, not adding and saving. Modifying files is what leave holes in the sectors as the modified file is saved to a new location and the old version is deleted (or rather that space is marked as available).If you load, save and add to files on a regular basis...
And, of course, "loading" a file has absolutely nothing to do with fragmentation. It is only when the file is modified that fragmentation might come into play and again that would depend primarily on how much free disk space there is.
So once again, just leave the Windows defaults alone and let Windows manage your drives (HDs and SSDs). W7, W8x and especially W10 know how to do it very well automatically.
If you really "need" frequent defragging, then you, as the user of that computer, have failed to provide adequate disk space and you need to either free up disk space by uninstalling unused programs, moving files to another drive or partition, and/or you need to buy more disk space. The worst thing you can do at this point is to install a 3rd party defragger - yet another program that takes up even more of your precious disk space.