After I installed Vista Beta 2 on my MacBook, I found that there are a lot of circular scraches on the installation DVD.
At first, I thought it’s just a single incident and didn’t pay much attentions to it. Later, I tried to burn a DVD under Tiger. The burn failed and when I checked the media. Guess what, I found exact same circular pattern of scratches on it. I then searched the web and found that it’s a common problem. I am sending my MacBook for a replacement.