I have looked all over the web and could not really find much and i must add the same machine (Laptop) when vista is installed never has this problem, so its definate that in my view its a windows 7 problem.
Anyway i hope you can point me in the right direction.
Yes the drive is in bios and device manager, the install was a clean install and windows 7 was downloaded from microsoft and is the release candidate.
No changes were made to the machine either in hardware or bios settings and everything running at default values.
Thanks but that option was one of the first things i tried.
Decided to have another go at putting 7 on this notebook and after alot of searching to try and solve the dvd drive problem i think i have cracked it.
It appears that i needed something called "Intel matrix storage controller" which i downloaded from the intel site, after reading that some people have been having this problem with vista, installed it, and i no longer have the problem of the dvd drive not appearing in explorer. Works perfect.
The chipset for this samsung notebook is a ICH9M and everything now works as it should.
Just thought i would post this as it might be of some help to other people running machines with the same chipset.