OK, so you're suspicious as well as ignorant.
Next . . .
Well it is PC to hate Windows and MS.
But the fact that you are trying to copy large numbers of files and
even full disk using MS copy command shows you lack knowledge as to
how the OS works.
But do carry on.
I could say, I suppose, that you obviously haven't the faintest idea
of why I was moving all those files, or why it was the best option in
those circumstances. But, really, it would be superfluous.
I mean, everybody knows that operating systems are designed so that
you can't copy large numbers of files and even full disks.
Right . . .
Gawd, have you ever used an OS that wasn't a toy? You might be
surprised to learn that normal OS's don't require third-party packages
to perform straightforward tasks; Windows does, because of its
perennially flawed architecture. The flaws in Windows and other
Microsoft products have literally spawned an industry.
Josh