02-10-2016 12:45 PM
Win 8.1 send TRIM commands itself. No need to do manual TRIM. TRIM is included in all modern operating systems. Windows 7, 8, 8.1, 10, and Mac OS 10.6 and higher natively support TRIM.
Your sata mode has to be AHCI in order for TRIM to make it to the drive. If you BIOS setting is IDE TRIM commands will never make it from the OS or if it is sent manually. If your sata mode is IDE you will need to go into the BIOS and change the sata mode to AHCI and reinstall the operating system.
Since the OS is sending TRIM there is no need to manually sending it. The drive has already been TRIMed so sending the command again additionally does not really accomplish anything.