kengr

Just make sure that your burner is rated for them.

There are 4 sizes:

DVD-R 4.7 gig
BD-R 25 gig
BD-R DL 50 gig
BD-R XL 100 gig

I love that one of the cartoons for safe handling has one sitting in direct sunlight with a check mark, rather than x-ed out. :-)

As I understand it, the data layer is essentially rock (obsidian or something?).

The burn side is *black* before you burn it and the burned areas are silvery gray after burning.

Now we can burn discs that are as stabled as *pressed* ones. Actually, *more* stable.