I want to buy an external DVD rom for my TC4200. I looked on the hpshopping.ca site but it really unclear, there's a listing for a cradle but it doesn't say if it needs external power and all in all it just sketchy. I want something that connects to my USB and is powered completely from my laptop, no other cables other then my USB. Does anyone know of any DVD Roms that can do this? I'm looking for something portable that supports USB 2.0. Thanks for the help.