Burning more than once to -RW

[clayto]

I am new to te mysteries of DVD burning but have succeeded in burning a test DVD Camcorder video as ISO to a -RW DVD. Now if I want to burn another I get an instruction to erase the disc, which I do not want to do. Is it not possible to add further videos to a -RW disc? If so how? Or is this only possibe with a RAM disc?

[lfcrule1972]

If you used ImgBurn to burn the iso it finalises the disc when the burn is finished, therefore it's not a multi-session disc (and this is not supported) and therefore you would have to erase that DVD-RW to burn to it again