I've been using "briefcase" to sync data folders. It works well for folders up to several hundred MB's.

My problem is now I'm dealing with folders that contain 10-30GB's. Briefcase begins to scan for differences and quickly shuts down.

Any ideas on a sync program that can handle folders this size?

BTW, I don't know if it makes a difference but the main disk with data folders is basic while the slave drive to be synced is dynamic.