Can't Enable TRIM

Discussion in 'MacBook Pro' started by 3568284, Jun 5, 2016.

  1. 3568284 macrumors newbie

    Jun 5, 2016

    I've replaced the hard drive of my MacBook Pro Mid-2012 running 10.11.5 by a Kingston SSDNow V300. Once installed Mac OS X, the first thing I've done is opening terminal to enable TRIMby using "sudo trimforce enable". After automatically restarting, I've checked the TRIM status on the System Information app, where it shows that it's still not enabled. Trying again I've realized that after confirming with the "y" twice when enabling TRIM, Terminal should show "Enabling TRIM...", then two more dots in the lines below and then "Operation succeeded. Your system will reboot momentarily, please wait...", as I've seen in some snapshots of the process I found on the internet. I my case, however, it's shown the "Enabling TRIM" and one dot, and then the system suddenly restarts. After restarting, Terminal is still open and it shows something like this:

    "[Restored 05 Jun 2016 22:28:38]
    Last login: Sun Jun 5 22:28:37 on console
    Restored session: Sun Jun 5 22:27:31 CEST 2016"

    Screen Shot 2016-06-05 at 23.33.52.png

    It seems that the SDD I bought indeed have support for TRIM, but somehow it can't be enabled in my case.

    Does somebody know why I'm not being able to enable it, or have it happened already to somebody? I've searched for a while in the forums but I haven't found the answer.

    Many thanks!!
  2. joecool99 Suspended


    Aug 20, 2008
    i've similar problem, Sandisk X400 SSD - no problems enabling trim - now on this computer, after the terminal command to enable, system restarts, but trim support remains - NO. Bizarre... this is not a clean install, it's a restore from standard drive.
  3. Intell macrumors P6


    Jan 24, 2010
    If you are on 10.11, you need to disable SIP before you enable TRIM or it won't work.
  4. chrfr macrumors 603

    Jul 11, 2009
    That's not correct. Trimforce will happily enable or disable trim with SIP enabled.
  5. Intell macrumors P6


    Jan 24, 2010
    While the 10.11 betas required SIP to be turned off, it's hit or miss with SIP enabled for production 10.11+. For maximum reliability, it's best to disable SIP before using trimforce to enable TRIM.
  6. kywp macrumors newbie


    Oct 14, 2016
    I, too, have a Kingston V300 120 GB installed in the main bay of a mid-2012 non-Retina MacBook Pro.

    I know this thread is about how to enable TRIM successfully with this set-up, but I'd like to pose the question of whether it can be done safely.

    Has anyone (original poster?) done this successfully and safely?

    - Yours n00bily
  7. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    That SSD uses a SandForce SF-2281 that is very commonly used with SSDs and you should have no issues using TRIM. I have not seen reports of TRIM under OS X with that specific SSD mode, but there are many reports of it working fine with that controller.
  8. 3568284 thread starter macrumors newbie

    Jun 5, 2016
    Thank you all for your help!

    I can't remember if I had SIP enabled or disabled, but I eventually got to enable the TRIM support. I think I didn't change anything, I just tried 2-3 more times and finally got the "Operation Succeeded" message. A few seconds ago the Mac restarted and when it rebooted TRIM was enabled.
    When 10.12 was released, after formatting the SSD drive and installing, I was able to enable TRIM after the first attempt. I actually had disabled SIP before for other purposes, but recently I replaced the HHD for a SanDisk SSD on a friend's MacBook Pro and I was able to enable TRIM also after the first attempt without having to disable SIP.
  9. Mac Hammer Fan, Nov 12, 2017
    Last edited: Nov 12, 2017

    Mac Hammer Fan macrumors 6502a

    Mac Hammer Fan

    Jul 13, 2004
    I have a MacPro with an OWC PCI-E SSD Accelsior and and PCI SATA III OWC with a Samsung EVO 850. I activated TRIM with the terminal.
    TRIM support is mentioned in the Samsung, but not in the OWC Accelsior PCI-e SSD.
    I had to disable TRIM on my computer because of the Accelsior PCI-E SSD.
    With TRIM enabled the XBench score dropped from 650 to 80!
  10. Samuelsan2001 macrumors 604

    Oct 24, 2013
    Yes the owc drives don’t support trim and are slower than what Apple was using in 2013 they really aren’t a great option, but the6 were the only option for a long time.

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