There have been a number of flood stories found that use details similar to the Noah's ark story.  The most well known is the Epic of Gilgamesh.

Does this disprove the ark story?  No way.  In fact, it helps to prove it. 

The Epic of Gilgamesh is dated to 1800-1600 BC, well after the actual Noah story which experts date as before 3000 BC.  It is clearly an attempt to explain the flood in their own way.  The Epic of Gilgamesh was written around the time of Joseph in Egypt, so civilizations had grown and polytheism ran rampant.

Here are two links to websites that do a thorough job showing the similarities and differences of other flood stories.

http://www.icr.org/article/noah-flood-gilgamesh/

http://www.noahs-ark.tv/noahs-ark-flood-creation-stories-myths-sumerian-kings-list-sumerian-eridu-genesis-kings-list-instructions-of-shuruppak-atra-hasis-epic-of-gilgamesh-berossus.htm