As you are using Sandisk toolkit, Ia ssume you are running Windows. On Windows 7 you can chek it by open a command line windows (cmd.exe) and enter the command
fsutil behavior query DisableDeleteNotify
If it outputs “0” TRIM commands are sent to the device - whether or not the commands are interpreted correctly by the device can not be tested (don’t know a way - may be there is an SMARt value that can be used as indicator?).
