To know if TRIM is enabled for a particular drive, open “System Profiler” and search for the “TRIM enable” information in the “Serial ATA sub-tree”.

If TRIM is not enabled, the easiest way to enable it is to:

  1. Download Trim Enabler
  2. Install “Trim Enabler”
  3. RunĀ “Trim Enabler” and enable TRIM
  4. Power off your computer and power it on again
  5. Start “System Profiler” and look if TRIM is enabled as described above

Be aware that some SSD does not support TRIM.