Earlier versions of macOS don’t support this command, but there are third party apps, such as TRIM Enabler ($14.99), that can enable it. In fact, Lion offers no simple switch to press to enable TRIM.
If you switch to a non-Apple SSD or upgrade your hard drive to an SSD, TRIM support does not get enabled by default. Apple enabled TRIM support in OS X Lion 10.7 but there’s a catch Apple only allows TRIM to work when using an Apple sanctioned SSD.
I don’t like to recommend third-party tools, as they often make system-level changes above and beyond those performed by the terminal command – and that may not be in your best interest long-term. If that doesn’t do the trick, you can try TRIM Enabler 3.0 or later for Mac. I recommend trying Chameleon SSD Optimizer first. If you don’t find success using the Terminal command to enable TRIM for your SSD, there are two third-party apps that can help you enable TRIM support. Updated: JanuHome » Freeware and Software Reviews » System Optimization and Registry Cleaner
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