How PS2 detec that is a CD/DVD-R?

How PS2 detec that is a CD/DVD-R and no is the ps2 original DC/DVD???

Simply put…there is a special section on the discs that cannot be read (or copied) by PC hardware.

If PS does not see this on a disc, it won’t play…and you need a modchip to bypass this…so you will be able to play the backups (of which you own the original of course)