These days, many meeting rooms have built-in projectors and/or screens. Some even have built-in computers so the need to lug a laptop with you has essentially been eliminated. Let’s face it, a USB drive will fit even the largest of presentations and can fit on your keychain – plus it won’t hurt your back. But even though all this is there to make your life easy, it can also work against you. Unless you test your presentation on the exact equipment that you’ll be running it on, you’re running a huge risk.