TRIM for Solid State Drives is in Mac computers only enabled for original parts. If you replaced your SSD with an aftermarket SSD, your Mac won’t use TRIM with it.
It will tell you so in the main screen of Disk Aid Pro:
With Disk Aid Pro, you can easily enable TRIM for your non-Apple SSD. Just follow the instructions below step-by-step.
Click Trim enable in the right pane of the main window:
After clicking Trim enable, a pop-up will appear as shown below. In this pop-up, click Copy CMD:
After you copied the command by clicking Copy CMD, you need to topen the terminal.
Enter [cmd]+[space] to open spotlight search:
Then type terminal in the text field and double click Terminal in the results:
The terminal will be openend:
Hit [cmd]+[v] to insert the command you previously copied:
You will be prompted to enter your password after inserting the command.
Important: Save all your work now, proceeding will reboot your Mac!
After entering the password, a warning appears because you are using TRIM for a non-Apple SSD.
You need to confirm wird [y]es to proceeed:
After confirming, you will be informed that your Mac will be rebooted. Make sure all your work is saved and then confirm once more with [y]es to proceed.
Wait until your Mac has rebooted, login and open Disk Aid Pro. You will now see that TRIM is enabled for your SSD:
What is TRIM anyway, and why should I enable it?
TRIM makes the operating system send a signal to your SSD every time you delete a file, making the SSD delete this file (instead of marking it “deleted”). Writing to empty flash is faster, since the data don’t need to be erased before writing. The SSD will become slower and slower over time if deleted files are not removed from the SSD.