I know exactly what you're saying about the disk!

This field is slated to be tiled this fall. That should eliminate most of the problem.

Funny you mention elevation data. I do have data from an autofarm rtk system but it's currently unusable. I had a post a while back that explained the issue but in essence, the data points were not in their correct position. It's because of the way autofarm base stations surveys it's position. It's correctable but doing so creates a whole host of other problems.