After the Yosemite upgrade, the third-party SSD trim fails and cannot be processed by the system.

No Zuo no die, which is not upgraded to Yosemite, and then found that trim activated in mavericks is not working here, and prompts that trim enable is not suitable for this version.

Then, the tragedy began. I found an old post and changed the kernel file according to the command. It was not suitable for Yosemite. Then I restarted the file and couldn't get in...

A prohibited logo is everywhere, so it's cool. I haven't even done mavericks's USB flash drive installation disk yet. I can't even drop it back. With PC in that crazy search, it seems that foreigners than me, some people solve the problem, when a friend, enter the following rescue miracle, shout amen and restart:

rm -rf /Volumes/<10.10 Partition>/System/Library/Extensions/IOAHCIFamily.kextcp -r /System/Library/Extensions/IOAHCIFamily.kext /Volumes/<10.10 Partition>/System/Library/Extensions/IOAHCIFamily.kexttouch /Volumes/<10.10 Partition>/System/Library/Extensionskextcache -u /Volumes/<10.10 Partition>

Then you can access the system, and then use the old software trim enable to activate trim with the command. The following is an excerpt from the Forum.

1. If you have used trim enabler on your computer, delete the following files:
/Library/privilegedhelpertools/org. cindori. authhelper

2. Run the following command on the terminal: sudo NVRAM boot-ARGs = "kext-Dev-mode = 1"
3. restart the computer...
4. Use trim enabler to enable trim. Remember not to restart your computer.
5. Wait for 1 minute
6. Run the following command on the terminal: sudo kextcache-M/system/library/caches/COM. Apple. kext. Caches/startup/extensions. mkext/system/library/extensions.
7. Wait until the command is completed...
8. Restart your computer

Check that the trim of SSD is enabled.