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Forked from clarencesong/os-x-enable-trim.md
Created November 21, 2012 11:10
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Enable TRIM in OS X 10.8.2 for IOAHCIBlockStorage version 2.3.1
Enable TRIM on non-Apple SSDs in OS X 10.8.2 Mountain Lion.
WARNING: This is ONLY tested on 10.8.2 (IOAHCIBlockStorage version 2.3.1), and NOT earlier or later versions.
Check /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/version.plist
Technical note: The driver changed in 10.8.2 and similar perl commands that worked in earlier OS X versions did not work for me once I updated to 10.8.2.
Run the following commands in Terminal…
1. Backup the original driver
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-backup
2. Modify the driver
sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\x00{1,20})[^\x00]{9}(\x00{1,20}\x54)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage
3. 2 commands to clear the system caches to enable OS X to pick up the modified driver
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
sudo touch /System/Library/Extensions/
4. Restart the Mac
@x128
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x128 commented Mar 28, 2013

Thanks! TRIM enabled on 10.8.3 (12D78), SSD OSZ Vertex 4.

@renauddetry
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Thanks for the tip guest4562345, working for me as well now.

@tzucc
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tzucc commented Apr 10, 2013

worked successfully on reboot... Trim Enabler app could not do anything, Leo's script fine as is ... OS X 10.8.3 (12D78) ... Macbook Pro mid June 2012, Samsung Pro 500GB.

@vgorloff
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Thanks leolimajr! Patch working for me too. 10.8.3 ( 12D78 ) MacMini Mid 2010 with Crucial M4 (CT128M4SSD1).

@hbayindir
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Thanks a lot leolimajr! It's working on 10.8.3, Early 2008 15" MBP & Intel 335 240GB.

@sp3c73r2038
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confirmed working on 10.8.3 (12D78) with Crucial M4-CT256M4SSD2 (installed in CD-ROM port)

thanks!

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