[QUOTE=eyeshield;2110584]DVD-burning software may not be required â€” discs can be used and accessed like a removable hard disk. Mac OS (8.6 or later) supports DVD-RAM directly.
it say dont have to use burning software… but why i cannot copy and past my file to the disk[/QUOTE]
You are mixing a few things together.
If you want to copy-paste to your disk, it has to be formatted first. It is the same as if you install a new hard drive. Your OS will not see it before you format it, than you can write to it.