![]() If reset, it will default to kext signing enabled and thus you will be unable to boot and must take the steps already outlined. The status of kext signing is saved in NVRAM, which can be reset accidentally (or manually). But since the signing mechanism was only introduced in Yosemite, having it disabled does not put you more at risk than you were on Mavericks or before that. This is a global setting, so it will apply to all possible kernel extensions which means you must be extra careful when installing drivers (which you probably never do on OS X) because it can't be verified they are trusted by Apple. So the only workaround is to disable kext signing altogether. That makes it necessary to boot to recovery mode and disable kext signing from a command line. The problem is that if you have TRIM enabled with the app and then try to boot a computer with kext signing enabled, it will refuse to boot since the TRIM extension is not signed. Now the developer of Trim Enabler has no way to get his extension signed (Apple would not do that because if they did, no one had to buy SSDs from Apple to get TRIM, a policy which I find appalling). With Yosemite, Apple introduced kext signing which means no kernel extensions will be loaded which are not signed (which can be done only by Apple). The Trim Enabler App uses a so-called kernel extension or kext (I think this is more or less the same thing as a driver, but I'm not sure). All was fine until the release of Yosemite. So to enable TRIM on third-party SSDs, one needs the Trim Enabler app which does it for you. The issue with TRIM on OSX is that it is supported only for SSD installed by Apple themselves. If you do not insist on a fresh install of OS X this is the way to go in my opinion. If you want to have certain parts of you user data on the HDD, you can create a symlink for that. What I did when installing the SSD was to put it in an enclosure, connect it via USB and use Carbon Copy Cloner to clone the OS and some other stuff to the SSD, while leaving the big data (movies, music, etc.) on the HDD (which I then put in the optical bay). If want to do a fresh install on the SSD, simply install it and proceed with your bootable USB, I do not see the problem. If you're running OS X on a HDD then I don't see how TRIM enters the equation, since TRIM is only for SSDs.
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