The cdrom module provides a few functions to initialize
the CDROM subsystem and to manage the CD objects. The CD
objects are created with the pygame.cdrom.CD() function.
This function needs a cdrom device number to work on. All
cdrom drives on the system are enumerated for use as a CD
object. To access most of the CD functions, you'll need to
init() the CD. (note that the cdrom module will already
be initialized). When multiple CD objects are created for the
same CDROM device, the state and values for those CD objects
will be shared.