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Today I watched my "Windows Resource Monitor" for some time and noticed that even when my system was on idle state( I was not running anything more beyond just Windows) there are some processes, such as "System" that keep writing on my hard disk. I took a picture of it (it is on Portuguese):

enter image description here

Why does this happen? Before seeing it I thought that there was no HDD activity when Windows is idle.

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up vote 3 down vote accepted

There could be log files that are being written to the disk, or the page file could be swapping in and out a little.

In short, just because you consider a state idle, does not mean that nothing is happening. Things are happening all the time, and sometimes that means that writes are happening.

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