Why is there a mini dvd mounted to the outside of the pheonix lander?

Question

Why is there a mini dvd mounted to the outside of the pheonix lander?

Answer 1

The Visions of Mars DVD was developed by the Planetary Society in Pasadena, California. It is made of silica glass for durability and contains the names of approximately 250,000 people from more than 70 nations, as well as selections of literature, art and music. For more information, visit the Planetary Society’s webpage.

Answer 2

To be an archaeological artifact found in the far future by martian colonists.

It doesn't really carry a real purpose, just like the golden records and plaques sent out on the voyagers and pioneers.