Many years ago I ripped a large number of DVDs, several hundred if not into the thousands, and the vast majority were dual-layer. Very few commercial movie releases were on single-layer disks, at least in the US. It sounds like you may be in another country so your experience may be different but where I am dual-layer disks were far more common.
I have the Rebel Blockade Runner UCS, I tried building it a few times and just couldn't find the right pieces. This set was before Lego started including numbered bags so it's just one big pile of bricks.