Yes. A hard drive. Not an SSD. NTFS.
As far as I know and see on the web - HDDs should be defragmented. That's why Windows NT does it in the background all the time. (Well, not really, since my computer is either in use or off.)
But apparently according to a user with high rep here:
There are tons of articles showing that defragging is no longer necessary.
I searched but couldn't find those articles. Not only that. I found many articles claiming the opposite. So, could someone please explain this? Perhaps, as with many other things, the answer is "it depends" - so what does it depend on?
Keep in mind that my question is not if there's a need for a 3rd party defragmenter, or if there's a need for scheduling a defrag, etc. My question is: On a Windows 10 system that is hardly ever idle, where all drives are the default NTFS, is there a need to use Windows' defragmenter?