When will win 7 start writing to hdd?


I was wondering, exactly when will windows 7 begin writing to the hard disk, instead of the RAM?
Is it when all of the RAM is "In Use" or could it happen even if only some is "in Use" and the rest of the RAM is on "Standby", as according to the resource monitor?

I don't know all that much about memory and the inner workings, just fyi :)
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More about when start writing
  1. It happens as soon as your computer loads windows up.

    You HDD is used as a cach for alot of small things you may not notice.
  2. Odd, I thought everything got put into the RAM. Is there any way to see how much is being cached to the hard disk?
  3. Just use the resource manager to monitor the amount of disk activity to get an idea yourself.
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