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Just throwing it here in case someone has encountered something similar. These two snapshots are less than 20h apart. My PC stays always on, but I am not aware of any application that would write data all the time.

Yesterday : enter image description here

Today: enter image description here

enter image description here

I tried cloning my OS on another SSD and same thing is still happening. Windows 10 x64, Build 18362. Power plan set to High Performance, but Hard disk turned off after 120min. Can anyone suggest a cause?

EDIT. There is a lot of writes from symantec, but other users have the same version installed and no problems:

enter image description here

The other notable writes are from explorer :

enter image description here

and svchost pid 12384 C:\Windows\System32\svchost.exe -k LocalServiceNoNetwork -p DPS

enter image description here

alfred
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  • Try Resource Monitor -> Disk tab. Check if there is something strange there. –  Nov 11 '19 at 16:15
  • Use [Sysinternals ProcessMonitor](https://docs.microsoft.com/en-us/sysinternals/downloads/procmon) to filter disk activity with write operations. May be you have a lot of applications logging all the time something. As each log write writes at least the page size (8KB) of your SSD TBW increases much more faster that actual data is written to the log files. – Robert Nov 11 '19 at 18:20
  • I am editing the question to add a process monitor screenshot – alfred Nov 11 '19 at 18:35

2 Answers2

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Most likely you are using Windows.

The NT kernel is designed as being disk-backed, with the actual RAM only working as a cache to this. This implies, that a lot of disk activity happens on workloads, that are not disk-intensive per se but memory-intensve.

You can reduce the NT swap file(s) to as little as possible, but be advised that there are workloads where not using disk backing will actually reduce performance.

Eugen Rieck
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  • Hi, can you link to information on where you change this. It rings a bell, but I am not sure. My paging file is 0MB – alfred Nov 11 '19 at 16:18
  • That’s too oversimplified a view. Most of the time, the page file is only used to back memory commitments, not actually written to. – Daniel B Nov 11 '19 at 18:43
  • Your quote of "most of the time" holds the answer - it is the reason why we are not talking Terabytes but only 100 Gigs – Eugen Rieck Nov 11 '19 at 18:52
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Hi, can you link to information on where you change this.

System Properties > Advanced > Performance Options > Advanced > Virtual Memory > Change

See the image linked. Sorry, not enough reputation to comment on @eugen-riek's answer.

enter image description here

beauk
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