On my ASUS "Black Plague" X54C laptop, I can get to my optical drive easily by removing the keyboard, as well as the HDD, memory, and wireless card. The CPU is a whole different story: I have to disassemble the whole damn thing to get to the CPU as well as the clock battery. My ThinkPad R40 is easier to get to the CPU: I just remove the keyboard from the housing and it's right there, and the optical drive is easier to remove as well.