Ubuntu Installation :: 9.04 Won't Read DVD's?

I recently picked up an HP 8510p laptop, and installed 9.04. Generally, the machine works well, but today I tried to install the Ultimate Edition, and found that the machine won't read DVD's. It reads and boots CD's just fine; that's how I installed Jaunty. When I open the fstab file, I notice at the bottom:

# /etc/fstab: static file system information.
#
# Use 'vol_id --uuid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).

[Code]....

I notice a "cdrom0" at the bottom. I also notice that the /cdrom folder is empty.

Sysinfo id's the drive as a Matshita DVD-RAM UJ-861H. Do I need another driver? Where do I find one, and how do I install it?

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