I have an old magazine that has an ad for a Power Mac, the model before the MDD. Any way, that ad mentions the Superdrive and does mention it as a DVD-RW. I wonder why Apple doesn't advertise it as a DVD-RW any more?
Whether a given drive can do -RW media is an issue with the hardware, not the SW. The laser needs to be able to handle the different dye layer/reflective qualities of RW media.
Recognising a CD/DVD as re-writeable is a relatively minor trick for SW or the OS. Once it can recongnise the disk as re-writeable, it uses exactly the same code already written and functional for write-once media.
Hmm, Interesting, but I find it a lengthy and drawn-out process to launch Disk Utility to erase it. I use Titanium anyways to prep and author data backups, so may as well erase it there. But thanks for the tip - good to know there's at least 2 ways to erase a DVD-RW disc.
" ... Hmm, Interesting, but I find it a lengthy and drawn-out process to launch Disk Utility to erase it ...".
Sure, if you have Toast, why bother. Save a little time.
If you don't, then spending an extra minute for 60 rewrites works out to paying yourself $90/hour (the money it would cost you to buy Toast, if you didn't know you could do it for free from the OS itself).