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@return1
Last active August 25, 2023 02:59
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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 (http://digitaldj.net/2011/07/21/trim-enabler-for-lion/)
# Update July 2014: no longer offline, see https://digitaldj.net/blog/2011/11/17/trim-enabler-for-os-x-lion-mountain-lion-mavericks/
#
# Looks for "Apple" string in HD kext, changes it to a wildcard match for anything
#
# Alternative to http://www.groths.org/trim-enabler-3-0-released/
# Method behind this madness described: http://forums.macrumors.com/showthread.php?t=1409151&page=4
# See discussion in comments here: https://www.macupdate.com/app/mac/39654/lion-tweaks
# And here: http://forums.macrumors.com/showthread.php?t=1410459
# And here: http://forums.macrumors.com/showthread.php?t=1480302
#
# Yosemite: for recovering from stop sign on boot screen, please see http://www.cindori.org/update-on-trim-in-yosemite/
# 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/com.apple.kext.caches/Startup/Extensions.mkext /System/Library/Extensions
# now reboot!
sudo shutdown -r now
@pvl7
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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 :(

@nychan
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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 https://www.cindori.org/trim-enabler-and-yosemite/, 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!

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

@ctismer
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ctismer commented Aug 21, 2015

but it no longer works with 10.10.5 :-(

@drichardson
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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.

@return1
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return1 commented Oct 16, 2015

for 10.10.4 and higher it is just: sudo trimforce enable

@defycgn
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defycgn commented Nov 14, 2015

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

@wviana
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wviana commented May 30, 2016

KINGSTON SV300S37A
Confirmed, in my case a 240G (KINGSTON SV300S37A240G)
by: sudo trimforce enable
Mac OS X: 10.11.5

@brianonn
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PLEXTOR PX-256M6S
confirmed works with 10.9.5 on Early 2008 imac8,1

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

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