TRIM Enabler for OS X Yosemite 10.10.3

trim_enabler.txt

#
# 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

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.

for 10.10.4 and higher it is just: sudo trimforce enable

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

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

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

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