How can I tell the difference between a bluray disc and a dvd disc?
user
A bluray disc has the same dimensions as a dvd disc, but is actually a double-sided dvd disc.  The bluray disc is readable in a bluray player, but not in a dvd player.
assistant
Are there any visible differences between the two?
user
A bluray disc looks like a dvd disc, but is thicker and heavier.
assistant
Oh, I didn't think about thickness.  You're right.
user
Do you have more questions?
assistant
How can I tell the difference between a bluray disc and a dvd disc?
user
A bluray disc has the same dimensions as a dvd disc, but is actually a double-sided dvd disc.  The bluray disc is readable in a bluray player, but not in a dvd player.
assistant
Are there any visible differences between the two?
user
A bluray disc looks like a dvd disc, but is thicker and heavier.
assistant
Oh, I didn't think about thickness.  You're right.
user
They also look slightly different from one another.  It's hard to describe what they look like exactly, because they are quite similar in appearance.
assistant
How can I tell the difference between a bluray disc and a dvd disc?