R2-D2's 7 inch floppy

Source

The irony is that R2-D2 is far more likely to support older formats as he least 30+ years old by the time Episode 4. (he is a relatively new machine at the beginning of Episode I  which is 32 years before the Ep 4, according to http://www.mts.net/~arphaxad/chronosw.html).

I guess they make things backwards redundant in the Star Wars universe.