Safely enable Trim on Yosemite and El Capitan!

Safely enable Trim on Yosemite and El Capitan!
July 2, 2015 Oskar

I am very happy to announce the new method to enable Trim on OS X Yosemite and El Capitan.

Using Disk Sensei or Trim Enabler, you can now enable Trim on OS X Yosemite (10.10.3 or later) and OS X El Capitan without disabling kext signing!

Thanks to new functionality introduced by Apple, I’ve been able to develop a driver that can enable Trim without modifying your system in any way. This is a huge breakthrough for Trim on OS X!

This means that:

Disabling kext signing is no longer necessary!
The “gray boot screen/stop sign” issue is gone!
Your system is no longer modified in any way!
Trim will no longer reset on updates!

This is the easiest and safest way to enable Trim on OS X. It is even better than using the new built in trimforce command, since that requires 10.10.4 and may require disabling system security on El Cap.

Here’s how to enable Trim safely on OS X Yosemite or El Capitan:

Disable Trim with your current Trim-tool of your choice (if you already have it enabled)
Download Disk Sensei (if you have it, update to version 1.2)
Open Disk Sensei and select Tools -> Trim
Enable Trim and reboot

Safe Trim Enabling is part of Disk Sensei update 1.2 and Trim Enabler 3.1. Full change logs:

Disk Sensei 1.2:
– Revamped Trim Enabling: Disk Sensei now uses a custom Cindori driver to safely enable Trim for 3rd party drives!
– Added OS X El Capitan support
– Added OS X 10.10.4 support
– Fixed an issue where Health (S.M.A.R.T) updates would trigger heavy drive load
– Fixed an issue with the center label in the Visual feature
– Fixed an issue with the Trim switch
– Added 7-day trial mode

Trim Enabler 3.4:
– Revamped Trim Enabling: Trim Enabler now uses a custom Cindori driver to safely enable Trim for 3rd party drives!
– Added OS X El Capitan support
– Added OS X 10.10.4 support

Comments are disabled. Please continue the discussion in the Forum.
Showing legacy comments below.


  1. wclyffe 3 years ago

    Oskar, don’t you mean Trim Enabler 3.4 coming later today?

  2. homever 3 years ago

    ….. may require disabling system security on El Cap.

    Should a “temporarily” be added?

  3. Jose Salas 3 years ago

    I’ve followed your instructions and now the stop icon appears even booting with the hd drive. I can’t access to the system. At least before this, this happened only if I tryed to boot from the ssd drive.
    Don’t know what to do now.

    • Oskar Groth 3 years ago

      Did you re-enable kext-signing? That could make other stuff break and cause the stop sign, if you have unsigned kexts installed. Disk Sensei 1.2 can not cause the stop sign by itself.

    • Mike Johnson 3 years ago

      I’ve had the same experience as Jose. I disabled Trim with Trim Enabler a few days ago and re-eanbled kext signing. I also purchased Disk Sensei and installed it (leaving Trim Enabler installed but disabled). Tonight, I upgraded Disk Sensei, enabled Trim in Disk Sensei and was greeted with the dreaded gray screen on boot. I followed your instructions at to get back to having a bootable system. My hunch is that I should have uninstalled Trim Enabler, but I’m not sure. I have another system at work to update. I’ll see what happens with it.

  4. Valentino 3 years ago

    Disabling Trim with my current Trim-tool (Trim Enabler 3.3) automatically re-enable kext signing on my Mac? Thank you.

  5. kusuma 3 years ago

    Does this mean by using Disk Sensei 1.2 is safe to update to Yosemite 10.10.4 and El Capitan public beta (when it comes out) without worrying kext problem?

    • Cpuroast 3 years ago

      That’s the idea, yes 🙂
      It no longer requires disabling kext signing and therefore leaves your system in a pristine, secure state, minus the extra signed kext it installs to enable trim.

  6. yuri 3 years ago

    Has the updated Trim Enabler already come out? You are doing a good job Oskar, but your time estimates are a bit off 😉

    • Oskar Groth 3 years ago

      Indeed, sorry about this. Working on it. Although I do encourage everyone to just download Disk Sensei instead, there is no reason to use Trim Enabler over Disk Sensei. Disk Sensei is much better option to enable Trim for everyone on OS X 10.9 or above.

  7. Ali Servet Donmez 3 years ago

    Hi, I have purchased back then Trim Enabled only, but I never used Disk Sensei. Does that mean Trim Enabler is not necessary any more for someone like me who didn’t use Disk Sensei anyway?

  8. Dzmitry 3 years ago

    Hi Oscar, thank you for your work you’re doing for the old MacBooks society. I joined the network of those who had issues with TRIM and purchased TRIM Enabler 2 or 3 weeks ago, right before the Apple fixed the issue. Since, you’re encouraging everyone to switch to Disk Sensei I’m wondering if you have in mind to offer discounted options for those who has already purchased TRIM Enabler and is considering to switch to Disk Sensei, so that not to pay for the TRIM function twice?

    Thank you.

  9. Billy 3 years ago

    So another $10 just to get the update?

    • Oskar Groth 3 years ago

      No, $10 to upgrade from Trim Enabler to Disk Sensei, which is a completely new software that is replacing Trim Enabler.

  10. Billy 3 years ago

    So I take it that you have stopes supporting trim enabler just because you want more money?

    Dude, that is ghetto.

  11. Chris 3 years ago

    Thanks for the update. So I updated to the new Trim Enabler without disabling it with the older version. Would kext signing have been reenabled just by updating to the new version or do I have to do something? How can I check?

    • Chris 3 years ago

      Oh, and right now whenever I check Trim Enabler it says “Trim has not been enabled through Trim Enabler, but is working anyway.” Trying to enable it and reboot doesn’t change this.

      • Chris 3 years ago

        So I uninstalled Trim Enabler 3.4 through the app and restarted. When I check my system report, however, it has a “Yes” value for Trim Support for my Samsung SSD. I’m confused.

        • Oskar Groth 3 years ago

          Make sure you first disable using an old version of Trim Enabler.
          It will restore kext-signing for you as well.
          You can download the 3.3 version here:
          Once you have disabled and rebooted, use the 3.4 version.

          • Larry 3 years ago

            Hi Oskar, I made the same mistake as Chris and installed Trim Enabler 3.4 without disabling Trim with version 3.3. I see you provided a link to the older version to disable Trim and restore the modified kext file. But when I install the file from the link you provided, I still end up with Trim Enabler 3.4. Please help me get my modified kext file back to how it was. Thank you, Larry

  12. Jarrod 3 years ago

    Hi Oskar,

    I currently have Trim Enabler 3.4 installed onto my machine. I will upgrade to Disk Sensei – but I was wondering how best to go about the change over? Just download DS onto my machine & install / enable, then completely delete TE from my machine?

    Do I receive a discount? I have been using TE for a long time & it works / has worked fine for me.

    I can’t wait to upgrade to EL Cap when that comes out & am glad I won’t have to worry about the grey screen anymore with updating.

    Thanks for your great software & support.


  13. Jarrod 3 years ago

    Hi Oskar,

    Disregard my previous post as I managed to upgrade to Disk Sensei no problems & deleted Trim Enabler all ok. I tried to get the discount for Disk Sensei – but I was unable yo get access to my licence key for Trim Enabler to then process the discount for Disk Sensei. Can you please help me out here?

    Also, within Disk Sensei, under the “tools” tab. I am unable to use the “Clean” button. It say I have 36GB available for cleaning, but I can’t clean. Won’t let me?

  14. Narimaan 3 years ago

    So just to confirm, the free version of Trim Enabler 3.4 CAN do safe trim on Yosemite (10.10.3) just like Disk Sensei without the grey screen right? I don’t have $20 at the moment to spend on Disk Sensei at the moment, but will probably upgrade soon and just wanted to continue using Trim Enabler 3.4 in the meantime (I’m still on Mavericks because I didn’t feel like dealing with the grey screen).

    • Oskar Groth 3 years ago


      • Narimaan 3 years ago

        Great thanks! I actually just downloaded disk sensei because I realized there’s a free trial so I’ll just use that until I upgrade this coming week. Thanks for all you do for the Mac community!

  15. yuri 3 years ago

    “Trim is enabled but not working. Perhaps your SSD does not support Trim or you need to restart” – What does this mean? I had it working before with the earlier version and reversed all changes. For a while I also had the Yosemite default TRIM enabled, but then disabled it so that I can do so using Trim Enabler. I restarted the computer a few times but it still keeps showing that message.

  16. Charles 3 years ago

    Same problen than yuri: “Trim is enabled but not working. Perhaps your SSD does not support Trim or you need to restart

    • yuri 3 years ago

      Charles, I have just reinstalled OS X from within the Recovery mode without deleting any of my user files and settings and it works now. I recommend you do the same 🙂

  17. Kai 3 years ago

    just wondering if there is still the free option to use trim enabler (or a trial cindori?) to just activate trim without the extra fancy options. I have the full version but use the free version sometimes to just enable trim on other macs. will trim enabler still be supported? thanks a lot for that great software!! kai

  18. Kai 3 years ago

    Hi Oscar. I am pretty confused by now…
    first: as larry mentioned the download link is downloading the new version 3.4…
    this morning after trim enabler pointed out a new version I did what it suggested and just installed it. without disabling anything. now I do not know if I should have disabled version 3.3 before updating to 3.4.
    mac is still running after reboot but I don’t know which trim method is active.
    I also would like to switch to sensei later but only if I am sure what is going on and that kext-signing is back on again.
    thanks again! kai

  19. Carlo 3 years ago

    I installed Disk Sensei 1.2 and uninstalled Trim Enabler 3.4. Is this correct: with Disk Sensei I don’t need Trim Enabler anymore? Trim Enabler checked at logon if Trim Enabler was active – I didn’t find a TrimCheck routine at the logon level?
    Does Disk Sensei the same check?

    • Oskar Groth 3 years ago

      No, with DS 1.2 or TE 3.4, Trim is no longer reset on OS updates. So this check is no longer needed.

  20. Umut 3 years ago


    Due to changes in 10.10.4 I have uninstalled TE 3.4 and then enabled kext signing within the Restore Mode with the command lines you advised and reinstalled TE 3.4 to activate TRIM without disabling the Kext signing.

    Now both in System Information and in Trim Enabler I can see that the Trim is enabled but TrimCheck insists that I do not have Trim Enabled when I restart to computer. I can just dismiss the message but I would like to know why this is happening. Any thoughts?

    Best regards,

  21. wclyffe 3 years ago

    Oskar, I turned TE (v3.3) OFF on my MacBook Pro running 10.10.3, rebooted to enable Kext, then I uninstalled TE completely. Upgraded to 10.10.4, then I upgraded to Disk Sensei (v1.2) and it all seems fine, but I have one question before I enable Trim now. It states I have 50gb available for cleaning. Should I do something about this prior to turning Trim ON in Disk Sensei?

    Oskar, thanks for all the hard work!


    • Oskar Groth 3 years ago

      It’s better to clean your drive with Trim enabled since then the data blocks will be trimmed also.
      The Clean feature includes “Large files” and “Downloads” that you may or may not be interested in totally deleting – I suggest clicking the name of the category and selecting individual items for those.

      • wclyffe 3 years ago

        Thanks, Oskar. I’m in good shape now with Trim running fine and I’ve looked through the files that the “Clean” function lists, and indeed, found a few I wanted to delete. Disk Sensei is classy program and is running great!

  22. wclyffe 3 years ago

    ps. Oskar, forgot to tell you that I think Disk Sensei is a great app and I appreciate all the hard work to make such an informative, beautiful interface for my SSD!

  23. Umut 3 years ago

    I think 3.4.1 addresses just what I have mentioned earlier. Thank you very much for your efforts and time Oskar. As wlcyffe said, you make great apps and it is much appreciated.

  24. Michael 3 years ago

    Hello Oskar,

    Still on Mavericks with SSD installed
    I’ve just purchased Disk Sensei, installed but forgot to disable Trim first. When I realised this, I disabled Trim, rebooted and enabled trim in DS. I notice that trim has also been re-enabled in my old Trim as well. What is the way forward please , am I ok to install Yosemite at this point? Do I need to uninstall Trim as it now seems to be redundant?

    Thank you

  25. Anders 3 years ago

    Hi Oskar,

    I bought Trim enabler a while back end been using it since.
    Can you please explain why I should keep using it since Apple now support third party SSD’s.
    What’s the benefit?

    • Oskar Groth 3 years ago

      Both methods will enable Trim in OS X for 3rd party drives on 10.10.4 and above, but using Trim Enabler will also work on 10.10.3, and on El Capitan DP1 without disabling system security. This, together with the benefit of being an easy-to-use GUI app, is why I consider Trim Enabler a better option.

      • wclyffe 3 years ago

        Anders: And Oskar’s not giving me anything to say this, but the added benefits of using Disk Sensei to enable Trim and monitor your SSD are completely worth the small added cost. At a minimum, I’d recommend using the trial period to check it out.

  26. Johnster 3 years ago

    – kext-dev-mode not present in nvram root-args means kext-signing is on default and protected?
    – Does this utilize the “forcetrim” functionality of El Capitan?
    – What is the helper being installed by trim-enabler?
    – How to check the rootless state, been playing with that previous.
    – Is the security setting in recovery partition menu also enabling rootless?

    • Oskar Groth 3 years ago

      1. Correct
      2. No
      3. Used for adminstrator privileges
      4. Boot recovery mode and use Secutity dropdown
      5. Yes

  27. Peter 3 years ago

    You say “use my tools they are better than trim force”, back on mavericks i bought trim enabler, can you please elaborate a little bit more on why trim enabler is better than using trim force, at the moment i am running trim using the trim force command, should i want to try trim enabler should i then first turn off trim with trim force then activate it again with trim enabler? did that make sense? english is not my native language 😉

  28. Russ 3 years ago

    So does this mean that I do not need to turn TRIM off when i want to update my OS X?

    • Oskar Groth 3 years ago

      Correct, there are no more issues related to updating OS X.

      • Braden 3 years ago

        I’ve been using the El Capitan developer preview since it came out in June and used Disk Sensei to enable trim on my third-party SSD. There weren’t any problems until I updated to the public release beta 1.0 which now causes the grey stop sign to show whenever I turn my laptop on or restart it. I’ve had to revert to the developer preview to avoid the grey stop sign. Any idea why it’s happening with the public beta, Oskar?

        • Oskar Groth 3 years ago

          You must have used an older version of Disk Sensei. You need to use version 1.2 to enable Trim on El Cap. If you enabled using an older version, you need to first disable using the older version.

          Disk Sensei 1.2 cannot cause the stop sign issue.

          • Braden 3 years ago

            When the most recent Trim Enabler version became available I decided to buy Disk Sensei 1.2 so I have been using the most up-to-date Disk Sensei. After updating to the Public Beta 2 today everything is fixed. Thanks for all your work making these trim-enabling programs Oskar!

  29. Steve 3 years ago

    Hello Mr. Groth,

    Macbook Pro early 2011 running Yosemite 10.10.4. Samsung SSD 850 Evo
    Three quick questions:
    I know that your page regarding “You can now safely enable Trim on Yosemite and El Capitan!” says that kext signing no longer needs to be disabled, but it is not clear if Disk Sensei has been written in a way that does not disable kext signing. Rather than make an assumption would you be kind enough to tell me if the latest version of Disk Sensei 1.2 still disables kext signing or if it does not disable kext signing? So to be clear the questions are:

    1.) Does Disk Sensei version 1.2 enable Trim without disabling kext signing?

    2.) If I do an upgrade to El Capitan or need to reset PRAM or any any other system reset do I need to disable Trim first?

    3.) I do not understand the “Clean” function, where can I find your video tutorials?

    Thank you in advance.

    • Oskar Groth 3 years ago

      Hi Steve
      1. Yes
      2. Nope
      3. You use the switches to select what files you want to delete, and then press Clean. To get full detailed list, click the category name.

  30. Gary 3 years ago

    Hey everyone, why don’t we have a list of SSD drives and TRIM success stats so that we know what is safe to use with a Mac. I got a fleet of Macbook Pros filled with Samsung 830, 840, 850 drives and I got no idea if this is safe or where to look to find out. Honestly we need a wiki on the different drives and the OS version/patch. And if you know of a list somewhere, please list it here – thanks.

  31. Tony 3 years ago

    My question refers to using TRIM on Fusion drives. I’m creating more and more of them these days as a lot of my customers are finding it a bit beyond them – just lazy probably – to keep their data sorted on a separate HD with the OS etc on the SSD.
    Is there any complication with using TRIM in a Fusion drive situation? Use it or not to use it, that is the question.
    Up until now I’ve only been using Crucial SSDs as they aren’t supposed to need TRIM… is that still correct in all circumstances?

  32. Hunter 3 years ago

    I’m with Tony above, what about a homemade fusion drive? Enable trim support before building it, after, or don’t do it?

  33. Thomas 3 years ago

    Two things:

    If I’m a paying user of Trim Enabler, is there any good reason why I should switch to Disk Sensei? I can’t find much on that topic in the above text.

    The above text still uses “Trim Enabler 3.1” in one place when it should say “Trim Enabler 3.4”, I believe.

    • Oskar Groth 3 years ago

      Disk Sensei is the successor to Trim Enabler.
      Besides offering Trim functionality, there are several other useful features such as advanced Health monitoring, task monitoring and statistics, cleaning features, and drive visualisation that lets you navigate your drive through a graph, making it super easy to find space-hogging files. It’s super useful for any drive, not just SSD’s.

      Trim Enabler will continue to be offered and supported (i.e, able to run it on upcoming versions of OS X), but is no longer actively developed and all new features are going into Disk Sensei.

  34. Irwan Ayoh 3 years ago

    Thanks For The Disk Sensei,Oskar Groth,From Singapore,God Bless…

  35. Eugenio Rodríguez 3 years ago

    I’m having a big trouble. I am using El Capitan, and the first beta versions worked perfectly with trim. With the last update I got into a never ending issue in which every time I turn on the Mac I get the gray page. I do all the process, fix it and when rebooting again, gray screen.

    The reverting all changes steps don’t work in el Capitan.

  36. Scott 3 years ago

    I’m pretty clueless so bear with me? I’m upgrading a MBP mid-2009 with an SSD drive. I’ve made a Yosemite 10.10.3 boot drive on a USB and backed up to Time Machine. I’m not sure about when to install Disk Sensei.

    Do I swap out the drives, install Yosemite on the new drive, restore from Time Machine and then download Disk Sensei and enable the Trim with Disk Sensei? Do I install Disk Sensei and get it running on the old drive before I swap, reinstall and restore? At any point in any of those processes will I have to disable Trim is stated at the top of the page (I hope not as I have no idea how)?


    • Oskar Groth 2 years ago

      Hi Scott
      There is no need to go through any special procedure before installing OS X. Just install Yosemite, make sure you are on 10.10.3 or later, and enable Trim with Disk Sensei.

  37. Robert Schwartz 3 years ago

    Oskar, any issues in updating to OS 10.10.5? I still have that leftover caution from the past about leaving TRIM enabled prior to updating. I’m using Disk Sensei. Easier to check in than be sorry. 🙂


  38. Francois 3 years ago

    A strange thing appeared on Trim Enabler 3.4.2: The message stating that “The driver is installed and trim is active…” is in English even of the French version. This message was in French on previous versions… No big deal, just to let you know. Thanks again for a great software. Francois

  39. Abby 3 years ago


    I am using MBP Mid 2012. I am currently running 10.8.5 (Mountain Lion). Using third party SSD and Trim Enabler 3.4.2 enabled. I want to upgrade to OSX Yosemite.

    Should I just update through app store without disabling TRIM or anything OR do I disable TRIM, then update to Yosemite and then re-enable TRIM. Also will TRIM Enabler 3.4.2 work fine in Yosemite without worrying about additional issues like grey screen, turning trim on and off for updates etc.

    • Oskar Groth 3 years ago

      There is no need to take any precautionary steps when installing a major new version of OS X as it will overwrite everything anyway.

      Make sure to update to OS X 10.10.3 or later before you enable Trim. Trim Enabler 3.4.2 will enable Trim safely on Yosemite, without the risk of gray boot screen issue.

      • David 3 years ago

        I am trying to do the same thing. I am running mavericks, and so from what i can gather from your reply was that if I disable trim on trim enabler 3.4 first and then upgrade this will prevent me from getting the stop sign and then I should be able to turn it back on after?

      • Abby 3 years ago

        Thank you Oskar for your reply. So my understanding is I should turn off the TRIM enabler, update to Yosemite and then turn on the TRIM again. Just like David says? Sorry if I am asking repeated questions as I am not sure if I my understanding is correct. I am not that technical but I manage with help.

        • Oskar Groth 3 years ago

          It makes no difference to disable Trim first or not. The OS X installation will reset everything anyway.

          Just do:

          1. Install Yosemite
          2. Install Yosemite updates 10.10.3 or later
          3. Re-enable Trim with Trim Enabler or Disk Sensei

          • Abby 3 years ago

            Great! Thank you for prompt response. Much appreciated.

    • Latrice 2 years ago

      Great hammer of Thor, that is pollrfuwey helpful!

  40. SaS 3 years ago

    Did anybody test Disk Sensei with newly released OS X 10.10.5 ? does it work fine ?

  41. Gregg 2 years ago


    Hello. I’m ready to take the plunge, but wary. What is the protocol for a Mid-2012 mac with OS 10.9.5, to add Disk Sensei? Do I download the Disk Sensei first, enable it, then do a Yosemite upgrade to 10.10? Or do I have to bypass the 10.10, and go to a later version 10.10.3? I’m asking because when I initially upgraded to Yosemite when it first came out, my computer was dead, could never get past the grey window. Won’t that happen again, with a 3rd party SSD installed? I do not have any trim enabler software loaded presently.

    • Oskar Groth 2 years ago

      Hi Greg
      1. Install Yosemite
      2. Install Yosemite updates 10.10.3 or later
      3. Enable Trim using latest version of Disk Sensei or Trim Enabler

      This procedure is guaranteed to not cause any issues, it’s perfectly safe now and also through future OS updates. However it’s important that you use the latest version of DS (1.2) or TE (3.4.2).

  42. Gregg 2 years ago


    Thanks for the concise answer. So, you’re saying that Apple did something since my being an early adapter upgrader last November-ish, so that I can upgrade without the grey screen of death issue? The genius bar couldn’t even get my computer to turn back on when I did this last year. I spent 2 days at the bar, left the computer, and spent 8 hours in the store – 4 days down. So, you can see my apprehension in just “1. install Yosemite”.

    • Oskar Groth 2 years ago

      As the post says, thanks to new functionality introduced by Apple, I’ve been able to develop a driver that can enable Trim without modifying your system in any way. This means that causing the gray stop sign is no longer possible.

  43. Gregg 2 years ago


    You’re still not answering my question completely. Here’s the issue – When I did the initial download of Yosemite, it killed my computer – dead. If I download and install Yosemite right now, will it do the same thing before I can even install DS or TE? I can’t experience the wrath of the grey screen again, it gave me PTSD. Please advise.

    • Oskar Groth 2 years ago

      Installing a major version of OS X has never been an issue since it overwrites all files that the old version of Trim Enabler modified. The only issues have been with enabling Trim after installing Yosemite and particularly between minor OS updates. If you don’t trust that, feel free to add an extra step to the instructions I gave above:

      0. Disable Trim and remove current versions of Trim Enabler/Disk Sensei
      1. Install Yosemite
      2. Install Yosemite updates 10.10.3 or later
      3. Enable Trim using latest version of Disk Sensei or Trim Enabler

      In my experience, step 0 won’t make a difference, but if it alleviates your PTSD I guess it’s a well spent 10 seconds.

  44. Nigel 2 years ago

    Do you remember that there were issues with Disk Sensei and using a fusion drive. I was testing the beta and discovered the problem when I went to manually trim with disk sensei. It screwed up my fusion drive since it saw it as one big drive. Just wondering if you did anything to resolve this like something which disables manual trim on disk sensei where a fusion drive is detected. Is it safe enough for me to use disk sensei with my fusion drive?


    • Oskar Groth 2 years ago

      There’s no reason to use the Manual Trim feature anymore. It was offered as an alternative to avoid the “Yosemite gray screen issues”, but with the new versions these issues are gone. So I recommend using automatic Trim (the switch). Manual Trim is always a worse alternative, and will never work properly on Fusion Drives.

  45. philippe 2 years ago

    Oskar, I purchased Disk Sensei 1.2, can you please confirm I can now safely clear kernel and extensions caches using Onyx (there is a warning when using trim enabler) ?

  46. philippe 2 years ago

    ok, worked perfectly, thank you !

  47. PlugN 2 years ago

    Is there any free version that is made only to enable TRIM like TRIM Enabler in El Captain ? I don’t need the rest of the functionalities… And I don’t want to pay 20$ just to activate TRIM in El Captain.

  48. SteveG 2 years ago

    When I uninstalled Trim Enabler, and rebooted, no errors, but when I install it, on boot-up or reboot I get “Java Runtime” error. How do I get rid of this and keep Trim enabler?

  49. SteveG 2 years ago

    For my above post, forgot to mention, OS X 10.10.5, mid-2010 13″ macbook pro, with Samsung Evo 850 500gb SSD.

  50. RunningMan 2 years ago

    Sorry if I missed this answer in the thread…I just upgraded to 10.10.x. Trim Enabler was put in the Incompatible Apps folder after the upgrade. Do I need to download the old version to disable? Or can I just install DS?

  51. Vik 2 years ago

    I am looking at upgrading my OSX to El Capitan. I have v1.2 of Disk Sensei and I have enabled the trim and rebooted a while back.
    Q. Upgrading to El Capitan I can just do it? Do I have perform any other processes before I upgrade my OSX?

  52. NightwatchNL 2 years ago

    Yes, you can (as Obama used to say)

  53. Jonathan 2 years ago

    I have been running Trim Enabler 3.4.2. I have just upgraded to OS X 10.11. Will Trim Enabler continue to function properly?

  54. Azaz 2 years ago

    Does the amsung evo ssd model MZ-75E120B/AM support trimenabler ? if yes, are there any precautions ….

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  56. Hoover 2 years ago

    MBP HDD crashed with no time machine backup (Wife’s laptop, and I am not a Mac-savvy dude). I am replacing it with a Sandisk Ultra II 480gb SSD. Used the internet recovery method (CMD-OPT-R) and have been able to get disk utility running. But can’t get the SSD to format properly. First Aid passes, Erase fails. Help????
    1. Is this a Trim issue?
    2. How can I manipulate trim w/o an operable OS X El Capitan?

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  58. RS 2 years ago

    This is my first time installing an SSD on my MacBook Pro (mid 2009). I did update my system to El Capitan and now the next step is to install the SSD. Correct me if I’m wrong but since this is the first SSD for my comp I don’t need to disable trim. I just install the SSD then I download Sensai then enable trim. Thanks!

    • Oskar Groth 2 years ago

      Correct, either way will work fine. There is no incorrect procedure once you are using Disk Sensei on El Cap.

  59. Edgar C. 2 years ago

    Just purchased Disk Sensei 1.2 today and so far, it works perfectly with no issues on El Capitan 10.11.3 using a SanDisk Ultra II 960GB SSD in my 17″ Macbook Pro (Early 2011). I bought Disk Sensei to enable TRIM which Apple disables for any 3rd party SSD. Before TRIM enabled: read speed 515.5 MB/s, write speed 244.1 MB/s and rewrite speed 129.1 MB/s. After TRIM enabled: read speed 536.3 MB/s, write speed 287.1 MB/s and rewrite speed 122 MB/s. I am happy with this purchase and will report any issues.

  60. Edgar C. 2 years ago

    Update: Just ran the Benchmark test in Disk Sensei 1.2 for the 3rd time and results went up. Results for read speed 532.4 MB/s, write 400.4 MB/s and rewrite speed 127.7 MB/s.

  61. Frencci 2 years ago

    I was buy Trim Enabler… Another app to buy again? ! Scandal! Back my money if You can’t protect my Imac with SSD! It’s joke or something?

  62. NATO Poppins 2 years ago

    I am trying you the Trim enabler out, lets see if this thing really works…

  63. Dan Laidlaw 2 years ago

    I’m running El Capitain with Disk Sensei and after running the OSX upgrade get the grey screen, it finally boots from the original internal mac drive and if I restart it on the ssd drive I find that the update to OSX has not been done… I emailed them asking about if I should turn off trimming but no reply back after a few days.

  64. Boisdequin 2 years ago

    J’ai acheté votre logiciel cependant j’ai du reformater mon disque dur .
    Je ne retrouve plus mon code d’activation.
    Pouvez-vous me le renvoyer.
    Je vous remercie d’avance.

    Bien à vous

  65. toyota tan cang 2 years ago

    Thank you for every other wonderful article. Where else may just
    anybody get that kind of info in such an ideal approach of
    writing? I have a presentation subsequent week, and I am at the look for
    such information.

  66. Tremblay Camille 2 years ago

    Avec «Disk Sensei» d’installer sur mon Mac Pro avec un disk SSD qui n’est pas un Apple…
    SI JE PROCÈDE À UNE MISE À JOUR DE SÉCURITÉ APPLE OU DE SYSTEM, dois-je désactiver avant de faire la mise à jour «Disk Sensei».

    Merci pour votre réponse…


  67. Will Carson 2 years ago

    Is it possible to enable trim on an external SSD (samsung 1 TB) drive? 2011 MBP El Capitain??

  68. Vernacular Keening 2 years ago

    Just to clarify matters due to mild attacks of blind animal panic:

    I’m currently on OX 9.4, using a Samsung SSD 830, disabled trim using Trim Enabler, downloaded the latest version of Disk Sensei, enabled trim and rebooted. Do I have to do anything else before upgrading to El Capitan to prevent gray screens, inaccessible partitions, etc., etc.?

  69. Humayun 2 years ago


    My MacBook Pro Mid 2012 is running on the latest OSX Version 10.11.6. I have installed a Samsung 850 Pro SSD as my main Hard Drive. Please confirm if this will work on OSX 10.11.6 SamSung 850 Pro SSD?

    Thank you

  70. Eduardo 1 year ago

    Sierra support?

  71. Richard 1 year ago

    Any chance of 10.10.5 support?
    I’m not planning on updating due to the age of the Macbook 2008 that I have.
    It currently shows “stop” and freeze on restart with Trim Enabled in Disk Sensei.


    • Oskar 1 year ago

      Hi Richard
      All our apps support 10.10.5 just fine. Make sure to use the latest version.

  72. Frustrated 1 year ago

    I’ve been having issues upgrading our Mac Mini (2010) with a 960gb Sandisk SSD. Seems no matter how I format, clone, install an OS, the SSD just won’t start up once it’s been internally installed. I’ve read about other possible OS install methods, but I’ve also run across that we may need to enable TRIM.

    Do you know if this is true for our situation, and… if your apps will help?



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