DVD Book Type Setting - Troubleshooting DVD Burning Problems
...DVDRW drives using "hacked" firmware for your DVD burner. Often the hacked firmware enables missing features such as overclocking the speed of the DVD burn and more importantly, setting the 'book type' permanently to "DVD-ROM". (more on that later) RPC1.org also offer "autopatchers", which are are easy do-it-yourself tools with an easy-to-use...
