Also for your consideration is this, supporting what my good colleague happyrock said
try doing a system image on a external usb hard drive...
DVD`s are always liable to damage, even the slight fingermark, may well stop it working. A scratch, so easily suffered, certainly will. They are a most unsuitable mediium for a backup of your important data.
As you use your computer and place on it more and more important documents, images etc. It is vital that these are backed up. - and indeed to a more secure medium than a dvd, or indeed a flash pen drive, as they are also unreliable.
Really important data should be backed up in two separate locations.
I am not saying to not save anything to DVD - I AM SAYING - do not ONLY save it to DVD.
Now to deal with the actual backup.
1. A complete image is a backup - a backup is not necessarily an image.
2. If your system becomes corrupted to the extent where windows will not load and cannot be repaired, even with the use of the excellent tools available in the Windows recovery environment OR with a custom install, previously referred to as a repair install of Windows on XP, then you will be faced with the use of the recovery parttion, sometimes included on OEM computers OR the clean install of Windows.
YOU will then be faced with the LOSS of all personal data not backed up and the LOSS of all programs, not installed when the computer was made and included in the reovery partition OR for which you do not have the installation media.
3. A complete image if made can then be cloned back to the hard drive.
http://windows.micro...-a-system-imageYOU CANNOT CHOOSE what to restore, when using a system image.
4. Your system inage will be approximately the size of all data on your hard drive PLUS the necessary files to create it and restore it.
Therefore as you will see the use of DVD`s is not a practical proposition.
5. That is SEPARATE from the Windows 7 repair disc created as here
http://windows.micro...tem-repair-discand that is vital for many OEM computers that do not include it. That disc will enable you to boot from the disc and access the repair environment.
6. Backup of Windows 7 selected data, as against the system image is here and can be easily done on DVD`s BUT again I would not recommend it.
http://windows.micro...k-up-your-filesYou can then choose on this what to backup, eg your documents etc.
YOU CANNOT backup programs, as they will not restore and work. The files and data that allow them to work are NOT in the program, as you access it from the folder on C Drive.
7. If you cannot get the DVD RW to work on the suggested backup of your personal data - try formatting the DVD - NTFS file system. first.