TRIMcheck: Does Your SSD Really have TRIM Working?


Through a more detailed initial analysis of TRIMcheck by TSSDR Forum members, simple bugs such as the fact that outdated drivers may affect the operation of TRIMcheck were discovered and the software’s author, Vladimir Panteleev (AKA CyberShadow) was invited to join in and provide thought on observations made of the software.

The ensuing workgroup that was formed has allowed Vladimir to provide various scenarios to our group for analysis, this to include a request for input on what elements should be included in a GUI for TRIMcheck.  A user-friendly GUI would certainly make TRIMcheck a more polished, “ready for prime time” software tool.

TRIMcheck image 6

As much as we seem to overlook the value of TRIM, over 6000 reads of this thread in the first five days is testament to its interest.  The information gained by new members, as well as those who have been with us for so long,  is proving to be instrumental in assisting with the development of this  software tool.

Is TRIM really working on your SSD?  Now you experience the reality of TRIM and take comfort in knowing that it is working.  If it isn’t, join the TSSDR Forums and let us help!

Head on over to the “TRIMcheck: A Freeware TRIM Tester” thread or download the software directly here.  Should you experience any difficulties whatsoever, jump into the Forums and become a contributor to progress!

User Rating: 0.55 ( 1 votes)


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    TRIM is merely a suggestion to the SSD controller that as it now contains no longer needed data, a certain sector(s) can be reused for garbage collection/wear leveling, if necessary. It’s not a promise to permanently erase such data as soon as possible.

    So, if especially during more or less idle drive loads the content doesn’t get zeroed after minutes or even hours after TRIM, this fact alone shouldn’t by itself be considered worrying. If anything, it’s worrying if the SSD immediately empties old content, which indicates that the SSD was either in immediate need of free blocks for wear leveling or that the implemented TRIM function is not operating very efficiently, wasting erase cycles as soon as it is invoked.

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    Cool tool, thank you for posting 🙂

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    My thanks to Vladimir for developing trimcheck. I was never fully convinced that TRIM was working on my system, even though “fsutil…” via the command prompt indicated it was on.

    Trimcheck confirmed my long-lived suspicion that TRIM was not working & provided me incentive to find out why. Mine was an AHCI driver issue, which I corrected. Now trimcheck has verified that TRIM is finally working!

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    Forgive me if this question is noob-ish… I’m wondering about the safety of having TRIM enabled based upon your 4-step diagram above. Step 2 indicates the block is copied into memory cache. Is this also memory cache also nonvolatile? It would seem that if power was lost after step 3 was completed and before step 4 was started, there would be data loss.

    If memory cache is just another location on the disk, then why have step 4 at all? I would think you would just copy the non-deleted pages to a new area on the disk, update the bitmap, then erase the source block.

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    I have a storage array with SSD’s. If I create a LUN from SSD and present to a windows client and format the LUN on windows . Now, If I run this trimcheck script on the formatted LUN on windows, Will this script tell me if my SSD in storage array supports TRIM OR not?
    Note: The Storage controller OS supports TRIM

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    Hello! I got two SSD drives. One 128 gb wiht OS installed (C:) and other 240 gb (D:), both proucted by PNY. When I run trimcheck at C: drive it says trim is working, but with D: drive it says Trim appears to be NOT WORKING. Why so? Anyone?

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    When I ran v0.5 of this I got an error the first several times when it tried to write extent 9 and said it could not determine the extent of the data. I have a png, but for some reason I am not able to post on the forum. I just registered there.

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    Martin Hawking Schwanke

    Another method, I found if you copy / paste this command in, and get a return of 0 (zero) then apparently Trim is working, My raid zero install of Win ten (on a Skylake Gen6 CPU rig with the latest RST driver / Firmware) when I ran Trim Tool it said Trim is probably not enabled, Win 8 on same machine reported it probably is. This is the script to copy / paste into CMD line – fsutil behavior query DisableDeleteNotify (press Windows key + R / type in CMD then paste – CNTL + V )

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      This only tells you if windows supports the command, not whether the drive does.
      Try running it on a regular drive/system, will return the same if the windows is new enough.

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    Hi all, TrimCheck shows it NOT to be working (or taking too long). However with AusLogics Defrag it will TRIM the drive (“Optimise SSD”) option. After running AusLogics TRIM TrimCheck shows the sector etc. was trimmed! Yay.

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    Christoph Stackmann

    Hi there,

    though this thread is quite old, I’ll give it a try.
    I have an Win2008R2 Server ProLiant ML110 G6 server with a X3430 XEON CPU on a Intel series 5 3400 chipset.
    I recently changed the HDD to a SAMSUNG 850 pro SSD.
    Unfortunally without getting TRIM to work. Well, it did with an old version of Samsung magician, but updating to the new version deleted the old one, while the new one won’t install.
    The system is running in AHCI mode.
    Thanks in advance,

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