It seems like you are experiencing an issue with your Sony DVD burner not recognizing blank discs properly on a Windows 7 beta machine. This could be due to compatibility issues between the beta version of Windows 7 and the DVD burner. Here are a few troubleshooting steps you can try to resolve this issue: 1. Update Device Drivers: - Make sure that the device drivers for your Sony DVD burner are up to date. Sometimes outdated drivers can cause compatibility issues. 2. Check Device Manager: - Go to Device Manager in Windows 7 and check if there are any exclamation marks or errors next to your DVD burner. If there are, try updating the drivers from there. 3. Firmware Update: - Check if there is a firmware update...