Ok this is a strange one. I have two notebooks both with slimtype dvd burners in them. The first notebook is an old advent 7113 and the second is a brand new samsung r519. I have been running the RC of 7 on the old one for a couple of months and just after i had installed it the drive packed up, bios would not see it, and windows would not see it. I just put it down to it being an old drive and ran the notebook without an optical drive. I decided to put the RC on the new notebook, went on without a problem, and guess what, yep, the dvd drive didnt show up in windows even though i had just used it to install the os, or in the bios. Now before anybody asks where i got it from, it was an official download from microsoft, and this rc has been tried on a desktop pc that we have and a friend has put it on his dell xps notebook, both without any problems. Could it be that 7 is having a problem with these makes of drives, but why wont the machines bios see it. I have since put the dvd drive back into the old notebook and booted from the vista restore dvd and my god, it see's the drive again and can install the os. I just cant work out whats going on. If there is a problem i wont be spending money on the release of 7 and have had a look on the web but cant find anything at all. The drive i have is a Slimtype DVD A DS8A3S Please tell me i am not losing my mind.