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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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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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