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TRIM Enabler for OS X Yosemite 10.10.3
# UPDATE for 10.10.4+: please consider this patch obsolete, as apple provides a tool called "trimforce" to enable trim support for 3rd party SSDs
# just run "sudo trimforce enable" to activate the trim support from now on!
# Original version by Grant Parnell is offline (
# Update July 2014: no longer offline, see
# Looks for "Apple" string in HD kext, changes it to a wildcard match for anything
# Alternative to
# Method behind this madness described:
# See discussion in comments here:
# And here:
# And here:
# Yosemite: for recovering from stop sign on boot screen, please see
# backup patched file
sudo cp /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage.original
# Important: Add "kext-dev-mode=1" as Kernel Arguments or the computer won't boot.
sudo nvram boot-args="kext-dev-mode=1"
sudo shutdown -r now
# looks for "Apple" string in HD kext, changes it to a wildcard match for anything
sudo perl -pi -e 's|\x00\x41\x50\x50\x4c\x45\x20\x53\x53\x44\x00|\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00|' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage
# rebuild kext cache manually (could take a while)
sudo touch /System/Library/Extensions
sudo kextcache -m /System/Library/Caches/ /System/Library/Extensions
# now reboot!
sudo shutdown -r now
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sudo trimforce enable

Yesterday, Apple had released OS X 10.10.4, including on it the new remarkable trimforce tool which allow native TRIM support for 3rd parties SSDs. This is a huge win for the Mac users community because the people had ask for this a while ago. I believe that Apple had made this decision because after the release of OS X Yosemite, which includes the new kext signing feature, Mac users were disabling this security feature, which when turned off, allows to execute arbitrary code in modified kext extension natively, WHICH was an huge security flaw. This been said, I guess Apple would rather prefer to allow their Macs to support 3rd parties SSDs and have Macs secured, than have a lot of hacked Macs and all the internet taking about it...

Although, old Macs are getting obsolete due to the absence of current technologies, most of the regular users still can extract a bit more juice of their Macs, so they will find this tool very useful. As for power users, I recommend just buying a new Mac...

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pvl7 commented Jul 2, 2015

"sudo trimforce enable" didn't work for me on 10.10.4. Still had to use the script to change the driver signature and disable security checks :(

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nychan commented Jul 12, 2015

I got some issue when disabling the changes done by this script and booted to the STOP sign screen after using sudo trim force enable, one of the crucial thing I missed when disabling the patched driver is I did not remove the patched driver file in "/Volumes/Your Disk Name", seems the guide in the link is good enough for me to fix, though I did mistyped chown/chmod lucky no permanent damage is done anyway, after all the mess I did at least it is working for the TRIM without a patched driver under 10.10.4!

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Used this script, even for 10.10.4, always perfect, thanks

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ctismer commented Aug 21, 2015

but it no longer works with 10.10.5 :-(

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Anyone tried with El Capitan 10.11 yet? I'm getting an Operation not permitted error when trying to make the backup of the driver in the first step.

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return1 commented Oct 16, 2015

for 10.10.4 and higher it is just: sudo trimforce enable

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defycgn commented Nov 14, 2015

New Solution worked for me on OS X El Capitan 10.11.2 Beta (15X40a)

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wviana commented May 30, 2016

Confirmed, in my case a 240G (KINGSTON SV300S37A240G)
by: sudo trimforce enable
Mac OS X: 10.11.5

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confirmed works with 10.9.5 on Early 2008 imac8,1

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'trimforce enable' worked like a charm on HighSierra. Thank you so much!

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