How to enable TRIM on SSD drives on Mac OS X


Note: If you bought your Mac with an SSD already installed this tutorial post is not for you, in fact Trim is already and automatically enabled by OS X for you since you’re using an original Apple SSD. If you bought a Mac with an Hard Disk Drive or a SSD and you replaced it with a third-party SSD, or you have an Hackintosh, follow this post and we’ll get Trim fixed!

Before we begin, I know you heard somewhere that Trim is great for SSD performances and that it can increase the durability of them but, do you know what Trim actually is?
If not:

Because low-level operation of SSDs differs significantly from hard drives, the typical way in which operating systems handle operations like deletes and formats resulted in unanticipated progressive performance degradation of write operations on SSDs. Trimming enables the SSD to handle garbage collection overhead.

If this simple definition is still not enough for you, jump over to Wikipedia where you will find a lot more.

So how do we being? First download Trim Enabler, an application developed by Oskar Groth, and place it in your Application folder, launch it and then follow those steps:

  1. Once Trim Enabler has launched click on the main switch to make it On
  2. Restart you Mac when asked in order to enable Trim
  3. Open Trim Enabler again and navigate to the Settings tab
  4. Enable the switch named “Check for Trim support on boot
    [In this way an alert will be shown if Trim will be disabled in the future]
  5. Done

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