The second version replaces a file and changes permissions. Rebuilds kextcache with kext signing off for a re-boot that in effect brings you back to where you were before it all started.
#Yosemite trim enabler update#
If you have to run the commands to boot into OSX and encounter a stop sign, here's a brief explanation of what is happening.ĭisables kext signing (which is what caused the stop sign in the fist place)Ĭauses the system to update timestamps on all necessary kextcachesģ) "kextcache -u "/Volumes/Your Disk name" Btw, those Samsung XP941s on PCIe cards in 2009-2012 MacPros are fantasic. On sample drives where libraries are set and nothing is added, they're not full, and it's basically just being read from, trim isn't an emergency. I think both mikehalloran and Michael Canavan had good points about the use of trim. If you've had kext signing turned off it might be a good idea to run that command and see what's installed. But the trim concern should be over if using 10.10.4.ītw, the command for printing out non-Apple KEXTs is "kextstat -l | grep -v com.apple". The commands are straight forward in what they do. I had to boot into Recovery Mode, then opened the Terminal, entered the commands and the OS rebooted fine. Luckily I already had the commands printed out, and again on my iOS devices in the Reading List in Safari. (There’s a big wide Internet out there that will guide you if you want to pursue this course.When I upgraded to 10.10.2 I forgot to turn off Trim Enabler and got the stop sign. Because I think it’s a terrible idea to disable this security measure I won’t provide you with the steps necessary to make it happen. And when you do, this opens the security hole that Apple has attempted to close.
Instead, you have to turn it off globally. Unfortunately, you can’t do this on an extension-by-extension basis. The only way to allow TRIM to work with third-party drives under Yosemite is to disable kext signing. Without it, you can boot from the SSD but it won’t run with the benefit of TRIM.
#Yosemite trim enabler mac#
In cases where you have such a modified extension installed, your Mac won’t be able to boot from the drive. If Yosemite encounters such a modified kext file, it won’t run. The workarounds that allow TRIM to function with third-party SSDs require that kext files are modified. With Yosemite, kernel extension ( kext) files must be “signed” (or approved) by Apple for security reasons. This worked perfectly well with Mavericks. Instead, you’d do some Terminal work or use a third-party tool such as Cindori Software’s Trim Enabler to make TRIM work with your drive. However, if you’ve installed a third-party SSD, that drive doesn’t use TRIM because Apple’s TRIM technology is not built to support it. If you purchase a Mac with an SSD or Fusion drive built in, the TRIM technology is working away in the background to keep your drive running at its peak. In sum, the two technologies speed up the drive’s performance so that it’s not performing a lot of needless move and erase actions. Invalid data is erased when the drive is otherwise idle. TRIM works at the operating system level and ensures that only the good data is moved. The controllers within SSDs have a technology called “garbage collection” that moves the data within pages-both the good and invalid data-to new blocks and then erases the old ones.
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