... er, because you need to have certain information written at the EXACT location of the boot sector on the CD. otherwise, the CD won't boot even if you included let's say "IO.SYS" or "MSDOS.SYS" or "NTLDR.SYS" or whatever boot files you need. but i can't remember anymore where the boot sector starts (0700h?), but i hope this makes sense. if anyone wants to correct me, please do so!
in nero, you would include a small extracted image file (like "xpboot.img" that you can find on the net) to make a CD bootable along with all the other files that you want to burn. nero would conveniently write the boot info into the boot sector for you, but the length of the boot sector needed to be modified. so, this procedure is not as simple and straight forward as it may seem.
no offense, but can I assume you have never tried to create a boot CD with copytodvd before??? :rolleyes: