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My Question again would be what should I do to control that activity? I have istalled windows 10 and still my disk is running at 100% due to that single system process ID 4
So the answer to "Why is System PID 4 having so much disk activity?" is: "Because it shows activity from other processes."
No.
The answer is that the SYSTEM process is not actually a single process but rather a group of processes, mostly drivers, that are running at the "system" level.
For example, the table below shows what's included in SYSTEM PID 4 (output from Process Explorer on a normally-running Windows 7 system).
There is no one answer to all of the problems experienced by people who use Task Manager to see "SYSTEM" behaving badly.
Your mission, should you choose to accept it, is to determine which of the drivers running under the "SYSTEM PID 4" umbrella is causing your problem.
To do that, you'll need to learn about one or more of the utilities listed at Sysinternals Process Utilities or perhaps pviewer.exe, discussed here: How to Break Down the System Process (there are numerous third party sites that say that they have pviewer.exe available for download; you can get a genuine version of it from any Windows XP installation CD or here: https://www.microsoft.com/en-us/download/details.aspx?id=18546).
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