What causes me to be unable to burn Windows 7 ISO due to a medium error? I've just upgraded my 2011 17" MacBook Pro with a brand spankin' new SSD hard drive and 8GB of RAM. In order to fully maximize the potential of the system, I'd like to install Windows 7 to take full advantage of the specs.

That being said, when I downloaded the Windows 7 ISO from Digital River, I was unable to burn it through Disk Utility. The burn failed due to a medium error, and I can't figure out why.

It's a brand new spindle of DVD-Rs, granted it's a brand I've never heard of, but I was able to burn a couple other items using them, so I'm at a loss as to what's going on here.

Any assistance would be greatly appreciated.
Looks like it was the oddball brand (Ativa) causing the issues. Bought a spindle of Maxell discs and it's burning like a charm.