> Why can't you also make a copy at the block level? I don't know about CDs / BluRays but similar to what user jaywalk answered: back in the floppy disks days

> Why can't you also make a copy at the block level? I don't know about CDs / BluRays but similar to what user jaywalk answered: back in the floppy disks days some copy-protection relied on physical differences created on purpose on the original game. It could be something as "simple" as damaging a track on purpose, by punching a hole in it. Then the game would try to read the data, any data, from that track. And the read command had to fail. A dumb block level copy wouldn't work: it could of course not physically punch a hole in a floppy disk. So pirate groups would crack the game and ship a version of the game without the copy protection and these could be copied at will.