If you have DVD-RAM disc in a cartridge and your DVD recorder does not support cartridges, you need to remove the disc from its cartridge.

Instructions:

DVD-RAM disc in cartridge

First you need to remove disc removal lock pin, by using the pointed end of a ballpoint pen or something similar:

Removed disc lock pin:

Next, open the lid, by using a ballpen to press the indentation located on the left side of the cartridge:

Open the lid:

Remove the disc from cartridge:

When returning disc to cartridge, make sure that printed side of the shutter and printed side of the disc are on the same side.

More Information: [Using DVD-RAM disc under Windows XP->using-dvd-ram-disc-under-windows-xp]