Situation: You install Oblivion. The game is now on your computer. Even though the game is on your computer, you still need the CD to run the game (for copyright reasons or something).

I know there's a patch that lets you run it without the CD, but I'd rather not get it.

So my questions are:
A. Does the CD make noise when running the game? (Or rather, does the CD drive run?)
and B. If I put the CD in to run the game, started the game, and then took the CD out... would the game continue to run or would I get an error message?

The DVD spins only to make sure that the disk is in there. Then there is no need for it to spin, since all of the files are on the HDD.
Yes, you can eject the disk, but it doesnt spin so, there really isnt a point of doing so.
And discussing No disk cracks is not allowed here.

Sorry, didn't know about the "No disc cracks" thing... >>;

Anyway, thanks for answering.

No problem, and its all good, you didnt directly use the No disk crack suggestion, just for future reference.

It is mentioned in the rules for this forum- http://www.gamesas.com/index.php?/topic/724862-forum-rules-and-general-information/

Locking since the question has been answered.