[CentOS] Where's My CD/DVD?

Tue Aug 25 19:27:40 UTC 2015
Steve Atkins <fsradio at comcast.net>

Hello,

I recently upgraded from CentOs 6.6 to 6.7 and among others oddities, my 
CD/DVD drive has disappeared from the system.  it lights up when I 
insert a disc and appears to be reading, but that's it.

Any thoughts?  Many thanks!

-steve