Depending on the model of your Toshiba system, you will want to see one of these articles:
The instructions are specific to the models I happen to own, T3100e and T3200SX, but to my knowledge should apply to other same series computers as well. Unfortunately I don't own the other models to be able to test and verify, but if you have any useful information, or would like to correct some details, I'd be happy to hear from you!