cdrom-detect udeb package in netinstall CD of Lenny

[Ravi Roy]

Hi,

I am using netinstall 5.0.4 of Lenny and I wonder if somone can throw some
light on cdrom-detect udeb package which is part of debian installer. I can
not find cdrom-detect.udeb in debian netinstall CD of lenny. Reason to ask
this is to understand that what is the flow of CD/DVD-Rom detection and
mount or how it works at lower level.

Thanks!

--RR