However, if you are running a system with TRIM Enabler and you upgrade your Mac to OS X Yosemite, your machine will not boot after the install finishes due to the new Kext signing requirement in Yosemite – all kexts (drivers) now need to be approved/signed by Apple.
If you’ve chosen to enable TRIM for use with an SSD not manufactured by Apple or OWC, we advise that you disable TRIM before upgrading to Yosemite to ensure your machine will boot properly after the install is finished. However, if you did not do so, there is a command line fix available. The fix can be found at www.cindori.org/trim-enabler-and-yosemite/ under the heading “Reversing any changes by Trim Enabler”. After following the listed steps, you should now be back in OS X with Trim disabled.
Yosemite Brings New Restrictions
Although OWC SSDs do not need TRIM to delivery consistent performance and longevity, we do see this change in Yosemite as another restrictive layer being added by Apple and that in of itself can be concerning. The typical consumer may not ever seek to do kext edits for special function additions, but it’s disappointing to be restricting this avenue for those more advanced and/or hobbyists.
For more on TRIM and why our advanced OWC SSDs don’t need it, check out this post on the Rocket Yard: blog.macsales.com/21641-with-an-owc-ssd-theres-no-need-for-trim