Does Update KB4571756 fixes the SSD defrag bug in Windows 10 V2004?

[German]In Windows 10 version 2004 there is the problem that SSD drives were optimized unnecessarily often by the Windows defragmentation. It looks like the cumulative update KB4571756 fixes this issue. Can anyone else confirm this?


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Bug defragments SSDs too often

In Windows 10 May 2020 Update (Version 2004) there is a nasty bug in the Windows Defragmenter. The drive optimization no longer remembers the latest version, but shows 'Never run, optimization required', as blog reader Volker noted in this comment at the end of May 2020. This leads to the unpleasant effect that SSDs are optimized more often than necessary. The bug was reported in January 2020 and should have been fixed long ago. I had described the details in the blog post Windows 10 Version 2004: Update KB4571744 will fix the Defrag bug

Microsoft tested the preview update KB4571744 with Windows Insiders in the last weeks. The description of the update also says that a defrag error is fixed. However, the hope that the bug that defragmented SSDs was fixed has been dashed. I had added the details in the blog post Windows 10 Version 2004: Update KB4571744 will fix the Defrag bug.

Update KB4571756 fixes the SSD defrag bug

This German comment already asked if the SSD defragmentation bug is fixed. The cautious answer from my side: Yes, but I did not test. In this article Lawrence Abrams discussed the preview update KB4571744 (2020-08 Cumulative Update Preview for Windows 10 Version 2004). According to his tests, the bug that causes excessive defragmentation of SSDs should have been fixed in the latest version of the update.

However, the description of the update KB4571756 does not provide any information about this. It only states that an error during defragmentation has been fixed: Addresses an issue that causes the Optimize Drives dialog to incorrectly report that previously optimized drives need to be optimized again. In the first versions of the preview update, users reported that the SSD defragmentation bug was still present. Regardless of this, the update KB4571756 for Windows 10 V2004 has now been released. Blog reader Derek M has posted this comment her in this blog.

This has finally been fixed for Windows 10 2004 in the September Cumulative update! Confirmed on 2 different computers! It now remembers the last time you defragged/optimized your drives after a restart!

The comment came to the post Windows 10 2004: Bug defragments SSDs too often. So the bug should be fixed. Can anyone confirm this?

Update KB4571756 for Windows 10 Version 2004

Cumulative Update KB4571756 is available for Windows 10 Version 2004 and for Windows Server Version 2004. It includes quality improvements but no new operating system features. I had addressed this update in the article Patchday: Windows 10-Updates (September 8, 2020).


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4 Responses to Does Update KB4571756 fixes the SSD defrag bug in Windows 10 V2004?

  1. wyxchari says:

    On my windows 10 Pro version 10.0.19041.508, defragmentation on SSD drives works fine after the latest updates on September 8th. When I open the defragmenter, it comes out that it requires optimization as it always said, I optimize it, reboot and it comes out well that it has been optimized 0 days ago.

  2. It was fixed in the KB4571744 preview update and included in yesterday's Patch Tuesday updates for everyone.

    The overfragging of SSD drives was not a bug on its own, but rather caused by the broken reporting bug.

    When taken in that context, what was fixed makes sense:

    "Addresses an issue that causes the Optimize Drives dialog to incorrectly report that previously optimized drives need to be optimized again. "

  3. Chris Pugson says:

    I concur with wyxchari and Lawrence Abrams. However, it also appears that a bug with defragging HDDs is not fixed. This bug is said to be trimming instead of defragging HDDs. Please correct me if I am wrong.

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