Make a backup copy of Dell’s Windows 7 Professional OEM DVD

I always like to have backup copies of my Dell Windows’ CDs and DVDs for service reason, but I couldn’t get the Dell Windows 7 Professional 32-bit DVD to copy, it would say that my DVD+R didn’t have sufficient space.  I saw that the Dell DVD was 4.8GB, so I bought a pack of  DVD+R Dual Layer discs and it worked!  Make sure your drive and software can handle dual layer discs.