Dump size is significantly different from disc size

Sometimes data on the disc shares the same physical sectors between different files.

For games this is sometimes used to duplicate the data for faster access, in which case the resulting dump size will be smaller.

For hybrid game/video discs it is sometimes used for blu-ray videos (almost always for 3D videos), in which case dump size will be larger.

You can see the expected dump size in the main info block, and you can see the physical disc size in the sector data during the dump process.

You can also see the sector data position reset sometimes when the current file shares earlier sectors.