You might try these steps for disabling a Synaptics touchpad. The steps 
for my laptop were similar.

http://smallbusiness.chron.com/disable-synaptics-touchpad-54254.html

Based on the Googling I've done, FN+F9 is supposed to toggle the 
touchpad on Toshibas. It's possible that yours turns on again when you 
accidentally touch the edges, which is an experience I've had with a 
previous laptop.

I also wonder if a mouse needs to be plugged in for the touchpad to be 
disabled. I managed to disable the clickpad on my HP. but that laptop 
has a touch sensitive screen, so people can interact with the device 
even when the touchpad is off. I'm speculating that we have such a hard 
time turn them off because they stay on as a safety mechanism?


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