It's a method, developed and owned by Sanyo, that helps prevent
buffer underruns when burning a CD. For a burner equipped with
burn-proof, when an underrun is detected, the burner turns off
and waits until the buffer refills before the burn continues.
For standard (no burn-proof) runs, when an underrun occurs, the
burn is terminated and the CD is ruined.
For tech info, search the Sanyo site...That's where I'd expect
to find it.
Kwad