SATA SSDs and PCIe SSDs use the same driver(s). That's the reason why TRIM works for SATA and PCIe connections.
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Enable TRIM support in 10.9
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See this thread,,,,
https://forums.macrumors.com/threads/1749965/
Long story short; Trim Enabler works, perl script, etc. don't anymore.
The only reason why Trim Enabler still works is that it just copies a modified IOAHCIBlockStorage file that originally dates back to Snow Leopard (10.6). This way, you introduce some bugs. I'd rather stick without TRIM than to use Trim Enabler. Just my 2 cents.
I am using Trim Enabler Version 3.2.2 paid version and it works ok on 10.9.4 on an OCZ Agility 3.
The only reason why Trim Enabler still works is that it just copies a modified IOAHCIBlockStorage file that originally dates back to Snow Leopard (10.6). This way, you introduce some bugs. I'd rather stick without TRIM than to use Trim Enabler. Just my 2 cents.
This has not been the case since Trim Enabler 1. Starting with version 2 the app just runs the Terminal command for you to modify the existing kext then sets the permissions etc. V2 and up do not replace the kext with the old Snow Leopard version. There was an old post around here somewhere from Cindori explaining this.
Agree With Weaselboy
Just ran the TRIM Enabler program, and it worked.
Did some digging around yesterday and today. Within the TRIM Enabler executable and app container, did not find any kext lying around. Code is doing something along the lines of the scripts people have of finding the pattern and replacing "APPLE SSD" with nul characters.
Also compared before/after the kext to see what's going on, and reinforces that old extensions are not being loaded.
So, with all that out of the way, here is the hex dump of the relevant section of the new extension for those wanting to go the script route and need to adjust their scripts. Old pattern was "Rotational\0APPLE SSD\0T". Now, note lots of other stuff between "Rotational" and "APPLE SSD".
Before:
![HRAwZIk.png]()
After
![Rnq6J1a.png]()
Just ran the TRIM Enabler program, and it worked.
Did some digging around yesterday and today. Within the TRIM Enabler executable and app container, did not find any kext lying around. Code is doing something along the lines of the scripts people have of finding the pattern and replacing "APPLE SSD" with nul characters.
Also compared before/after the kext to see what's going on, and reinforces that old extensions are not being loaded.
So, with all that out of the way, here is the hex dump of the relevant section of the new extension for those wanting to go the script route and need to adjust their scripts. Old pattern was "Rotational\0APPLE SSD\0T". Now, note lots of other stuff between "Rotational" and "APPLE SSD".
Before:
After
Last edited:
Thanks NoBoMac
Based on that I confirmed that the following patch does the trick if anyone wants to use perl.
Code:
sudo perl -pi -e 's|\x00APPLE SSD\x00Time To|\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00Time To|s' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorageThe driver compares only the string, and works without problems, if the string length (a C-String) is zero!?
Yes and it works fine even though it's beta. Funny thing is hat Trim Enabler never stopped working. I wonder what they do differently.
Thanks. I prefer a shell script. Somehow I feel safer with it because I know what it is doing..
Someone pointed me toward this: https://gist.github.com/return1/4058659
Code:
sudo perl -pi -e 's|(^\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/IOAHCIBlockStorageI'll try out in a jiffy.
Seems like it.
Might work, but would not be comfortable using. WAY too general. If I'm reading it right: find a pattern of 1-20 non-nul characters, then 9 non-nul, 1-20 nuls, then a capital T. Going forward, this pattern could potentially match lots of things, ergo, might nul out the wrong thing, ergo, box that might not start.
Rkbca1's solution is much better, imo, since looking for very specific patterns and much less susceptible to wiping out the wrong thing.
The only reason why Trim Enabler still works is that it just copies a modified IOAHCIBlockStorage file that originally dates back to Snow Leopard (10.6). This way, you introduce some bugs. I'd rather stick without TRIM than to use Trim Enabler. Just my 2 cents.
This is false information.
Trim Enabler 1.0 (released back in 2011) used this as a method. It also had a label stating "Only for use on Snow Leopard".
Ever since Trim Enabler 2.0 (released back in 2012), Trim Enabler unlocks the kernel extension directly, leaving your OS otherwise unaltered.
Trim Enabler has made quite a journey since then. Here are screenshots of version 1, 2 and 3 respectively to put things in perspective.
great work, and great explanation Cindori. You are a talented coder, and I appreciate your hard and dedicated work.
Would you consider investigating and implementing an option to clear & trim unused portions (free space) of the drive? This would be a really nice touch if possible. Of course this would be a paid option in your pro version.
Thanks again for a great App.
The above commands weren't working for me on 10.9.4. Running this series (found here https://gist.github.com/clarencesong/3768688), however, did:
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
sudo perl -pi -e 's|(^\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
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
sudo touch /System/Library/Extensions/
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
sudo perl -pi -e 's|(^\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
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
sudo touch /System/Library/Extensions/
Worked for me on a Mac Pro 3,1 running 10.9.5 combo update with Samsung 850 EVO 1TB SSD -- Thanks!
Thanks so much for the pictures. I know this is an old thread but some of us are still happily using these old systems - mbp2.2 in my case.So, with all that out of the way, here is the hex dump of the relevant section of the new extension for those wanting to go the script route and need to adjust their scripts. Old pattern was "Rotational\0APPLE SSD\0T". Now, note lots of other stuff between "Rotational" and "APPLE SSD".
Before:
![HRAwZIk.png]()
After
![Rnq6J1a.png]()
I couldn't understand what these scripts were doing so I based on your pictures :
- Downloaded the 0xED hex editor (free)
- sudo Downloads/0xED.app/Contents/MacOS/0xED
- search 'APPLE SSD' and replace both instance with x00 (take edit > write mode option to overwrite) and save.
- sudo kextcache -system-prelinked-kernel
- sudo kextcache -system-caches
- sudo touch /System/Library/Extensions/
- reboot
I had previously tried downloading Trim Enabler 4 but unfortunately it doesn't work as I'm running 10.7.5. It says "Requires macOS 10.9 or later. Versions for older macOS included " but this seems not to be the case. I couldn't find the old free version 2 anywhere I trusted so you saved me EUR 16.79 with those pictures - thanks.