If I base it with their performance, M645 is better than R705. M645 is quieter and does not heat up easily. The feature is really meant for personal use or for school. There is no big difference with the price when I check it through online, so I'll choose M645 with Processor Intel Core i5 i5-450M / 2.4 GHz with Max Turbo Speed 2.66 GHz, Features Intel Turbo Boost Technology and so many features. If you want to get the details, I'll add it in related links.
For the Toshiba Protege R705 you press the FN (function) key and hit the TAB key. You then get the optical drive mini menu. Keep hitting the TAB key until you get what you want: ON, Eject, OFF.
Check out http://gc.kls2.com. It's called the great circle mapper, and it'll give you an idea of what the shortest path between the two cities is. Just so you know, that flight will take off to the west from Heathrow, fly over Northern Ireland, just south of Iceland, cross the southern end of Greenland and Baffin Island, make landfall around Churchill in Manitoba, and enter the U.S. in western Montana.