I want to create a boot disc for Windows 7, I copied all the contents of original Windows 7 CD to my recently brought clean DVD-R disc with NERO. It just worked once on my friends computer and when I tried it second time, it failed to boot from DVD-R. I had set the BIOS settings correctly in boot menu. It tried to boot from DVD but it didn't find any boot info.
(When I insert original windows 7 CD it boots correctly)
Then I deleted all the folders in DVD and thought I would paste them again later, all the folders got deleted leaving behind used space. When I open it, it shows the DVD empty but almost 1/2 of the space is used up and I cannot paste my Windows 7 setup in it again.
I tried formatting it again and again but it still shows 50-60% used space.
Is there some way to completely erase my DVD-R?