There is no easy supported method to do that from Windows itself but here are a few ways we’ve found how to do it. However, seeing that I’ve already removed the internal DVD drive and try to avoid plugging and unplugging the USB slim DVD writer, I need to install the Windows 7 system recovery onto a USB flash drive. I have also started using the Windows 7 system image backup and restore feature, so there is no need to create a Windows 7 Rescue Disc in case the boot loader gets wiped off. Everything can be run from USB nowadays such as Hiren’s BootCD, antivirus rescue discs and even installing Windows 7. I do have an external USB slim DVD writer though if I really need to use it.
Secondly, although a DVD drive doesn’t take up much power, I know I am saving some (around 20 Watts) from not having it. Removing it gives more space for air ventilation. I found that it is unnecessary because the 5.25″ DVD drive is too big and takes up too much space. Believe it or not, my old desktop computer doesn’t have an internal CD/DVD drive.