[tzs]

> A 6" wafer will also have lots of dies on the edge that don't pass automatic testing. Don't forget that most devices are located near the edge.

I don't understand this. Given a fixed size die, the number of dies near the edge would go up linearly as the wafer size goes up. The number of interior dies would go up quadratically.

[tedsanders]

Yeah, what he/she is saying doesn't really make sense. Perhaps he/she means that there are problems with uniformity and the dies on the edge suffer most, not because they are next to an edge, but just because they are further from the center. In that case 2-inch wafers may make more sense than 6-inch wafers.