InBlack wrote on Mar 29, 2012, 10:18:
Basically what we have here is a modern day equivalent of the CD-CHECK of the late 90's. Remember that guys?

You installed the game, and every time you started it your CDROM would spin up (usually producing some kind of weird high pitched sound) to check whether the original CD was in it. Even though all the assets were installed in the game folder and there really was no need to access the CD.