Both SPDF (Single Pass Document Feeder) and DADF (Duplex Automatic Document Feeder) serve the same purpose: they scan both sides of a document automatically. However, they use different technologies to get the job done. The Short Answer
Fewer moving parts and no "flipping" mechanism mean less chance of tearing your originals. Choose DADF if: Budget is a factor:
SPDF: Slater-Type Orbitals for Accurate Wave Functions
SPDF stands for Single-Pass Duplex Feeder.
It is considered "best" for businesses that handle fragile, damaged, or very thick documents because the paper stays flat as it passes through the feeder.
