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Windows 10 Defrag TRIM bug still not fixed after six months


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After the release of two Windows 10 feature updates and numerous cumulative updates, Microsoft has still not fixed a bug causing Windows Defrag to TRIM non-SSD drives.




In May 2020, Microsoft released Windows 10 2004, the May 2020 Update, and introduced two bugs causing SSD drives to be defragged too often and for the TRIM operation to be attempted on non-SSD drives.


The first bug prevented the Windows 10 Automatic Maintenance feature from remembering when a drive was last optimized when the operating system was restarted. The forgetting of the previous optimization date would cause drives, including SSD drives, to be defragged on every computer reboot.



Defragging an SSD drive



In September, Microsoft released the "2020-08 Cumulative Update Preview for Windows 10 Version 2004 (KB4571744)" update, which fixed the Automatic Maintenance bug causing SSD to be defragged too often.


The second bug caused the Windows 10 defrag feature, Optimize Drives, to attempt to TRIM non-SSD drives. While this would not damage the drive, it does generate errors in the event log.


Today, almost six months later, Microsoft has still not resolved this bug, as shown by today's test below.




Defrag is still trying to TRIM a non-SSD drive


Even though this bug has been reported extensively, Microsoft has also not officially acknowledged in the Windows 10 health dashboard that this bug exists.


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1 hour ago, Sylence said:

My SSD Trips/Optimizes just fine on Windows 10, in the past 4 years.

It's not a SSD bug  it's a bug with regular HD if you dont have a HD it don't  concern you . hard drives dont need trimmed they need to be defraged but windows 10  is trying to trim them. It dont hurt HDs,  it just cause Windows to spit out errors.  it always worked for SSD  they was a bug were it was causing   SSD to be Defrag too often SSD should only be defrag once a month   but they fixed  that  if you have done that update automatic maintenance should only Trim SSD because windows will defrag it by default  .  It helps if you read  before commenting ..:tooth:



Storage Optimizer will defrag an SSD once a month if volume snapshots are enabled. This is by design and necessary due to slow volsnap copy on write performance on fragmented SSD volumes."



The automatic maintenance doesn't distinguish between SSD and HDD.




Source: https://www.wilderssecurity.com/threads/bork-tuesday-any-problems-yet.370217/page-245#post-2922895


Its been like since June the bug came with Windows 10 version 2004 and they still don't fix it. So  you need  to disable  auto defrag  when using a  Regular  HD   and just do it manually  so it dont spit out errors  . Or  install a 3rd party one to auto  defrag.

Edited by steven36
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35 minutes ago, mp68terr said:

How to find out about smr v. cmr? Hardware info apps I've checked do not show this info.

Is it necessary to check the hdd model then maker site?


with CrystalDiskInfo I've noticed in few Seagate 2TB HDDs that have TRIM feature due are SMR type.

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19 hours ago, SPECTRUM said:

I guess is not really a bug, because most of the common HDDs are SMR type annd not CMR, so they require TRIM.

If its spiting out Errors on your PC its a bug  with the defrag  are it would not be spiting out errors  .

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20 hours ago, SPECTRUM said:


with CrystalDiskInfo I've noticed in few Seagate 2TB HDDs that have TRIM feature due are SMR type.

If you Bought a SMR  drive  you got ripped  Off  and Most HHDs are not  SMR , SMR  aren't  suitable to use as a main drive to run a computer from there too slow.


Western Digital Fesses Up: Some Red HDDs Use Slow SMR Tech Without Disclosure



WD Red , Seagate’s Backup Plus family , Toshiba has been caught  putting them in consumer units.


None of these HDD manufacturers disclose  the fact they selling you a slow SMR drive  and  a good reason to buy SSD instead


Western Digital, Seagate Are Shipping Slow SMR Drives Without Informing Customers: Reports [Updated]


Customers have already been burned by the swap. If you’ve already used PMR-based WD Red drives in your RAID array, attempting to include SMR drives may not work at all. According to Western Digital, the 8-14TB drives they sell are all based on PMR, while the 2TB-6TB parts are all SMR drives. The performance difference between the two is significant, with the 2TB -6TB drives in the 150MB/s to 180MB/s range, while the 8TB-14TB drives run at 198MB/s to 215MB/s. While SMR drives are cheaper to manufacture than PMR drives, none of the savings is being passed on to customers as far as we can tell.



SMR uses perpendicular magnetic recording, making it a form of PMR. Since calling SMR PMR would be accurate, the original PMR was renamed CMR, conventional magnetic recording, to eliminate ambiguity.


List of WD CMR and SMR hard drives (HDD)



List of Seagate internal  CMR and SMR hard drives (HDD)



WD Red SMR vs CMR Tested Avoid Red SMR




CMR, which stands for conventional magnetic recording. This has been the standard technology behind hard drive data storage since the mid-2000s. Data is written on magnetic tracks that are side-by-side, do not overlap, and write operations on one track do not affect its neighbors.


Most people  that use HDD  are using  CMR  For Drive C  ,  SMR is new  , And most people that buy new PCs   use  SSD instead  even many OLD PCs they use SSD instead. If you have  CMR drives  hooked up with SMR it can cause  bad problems besides the fact there  slower than CMR .

Edited by steven36
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