[Update 1: We got our answer. The entire thing is blown way out of proportion. There are still padding files, but they're a relatively meager 420MB per region. 2: We've removed the original headline which read "Resistance = 17.75GB of garbage?" We've maintained the original post below for accountability, but remind readers that the speculative remarks about the game's size aren't accurate.]
Resistance: Fall of Man was billed to be the defining game for why Blu-ray exists in the first place. Resistance developers Insomniac stated that the game took up 22GB of space and that all those bits and bytes were necessary to make the game work. It would seem that ripping the disk in Linux shows otherwise. A NeoGAF forum member by the name of squatingyeti posted a long list of padding files on the Resistance disk; the padding took up approximately 17.75GB of space. Padding is frequently used to push data to the outer edges of the disk to improve read times, but Blu-ray is supposed to be a constant read over the entire disk. It's possible that the data isn't fully true and we would like to see some confirmation; however, if this report that 81% of Resistance is just empty filler and could fit on a single-layer DVD is accurate, will this put a hole in Sony's claim that Blu-ray is absolutely necessary this generation? The padding isn't needed to make the read speeds any better and (if true) is a lame way for Sony to justify Blu-ray for gaming.