it seems to be reported as smaller than it actually is. this is a video file that I just ripped today, it also is reporting a massive size discrepancy on the disk. It’s also important to note that video media such as this can’t easily be compressed losslessly (which shouldn’t account for the size discrep.)
It would be nice if there was a warning somewhere that usable capacity (used + unused) wouldn’t match expectations, but a better idea is to tell the user what they reasonably should expect.