Enable TRIM in OS X 10.8.2 for IOAHCIBlockStorage version 2.3.1

os-x-enable-trim.txt

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

Thank you leolimajr! I've been looking all over for this.

I'm running OS X 10.8.3 on INTEL SSDSC2CW240A3. The above code worked for me. I modified my existing bash script to include the "x54" hex code. Previous script used on 10.8.2 (note "x51" diff):

sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\x00{1,20})[^\x00]{9}(\x00{1,20}\x51)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage

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

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

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.

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

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

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

thanks!