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#1
How are you measuring the temp from the hard drive? That temp is nothing to worry about. There is a long list as to why your hard drive has activity. Modern drives have a computer onboard these days thatrun tasks handed off from the CPU and other chips on the motherboard.
@mikelferdinan -
If you have the funds, a SSD boot drive will make your computer "shine."
What AV/FW are you using. Norton?
When the system is in an idle state, defragmentation tasks like these are generally run by the AV software and can be turned off.
Yes, housekeeping stops once you start using the OS. Some activities can take up to a finish to get to where a endpoint can be set to allow for the OS to remember where to continue when you log out.
I never leave a system just sitting idle. I always shut it down since housekeeping has become something that can take less than a minute with a properly maintained machine.