I know the method how to rip a ps2 game.
But this method never works on PS3.
I tried 2 games,both can't boot on PS3 and PCSX2.
The term "ripping" is a bit misleading, the oldest definition is about removing files or replacing files by other files of smaller size... with the goal of reducing the game size
Is like the british "jack the ripper" that was removing parts from human bodies (sorry for the disgusting comparison)
Later the term ripping was used also to the procedure used to create an 1:1 copy of a optical disc
Are very different things as you can see
In my previous post i was talking about reducing the game size (so i was meaning about the first definition)
In general is a bad idea to remove files because the game could have functions that checks that files... and is hard to know if the game checks them... so as prevention is better to dont remove any file
Just to show an example with PS3... in many PS3 games when we boot the game for first time it performs the "gamedata" installation (it copyes files from the optical disc to dev_hdd0)
If you remove that files the gamedata installation fails with an error... so the game doesnt boots
But if you replace them by a 0kb dummy the gamedata installation copyes the dummy like if it where an official file (this means the game is not checking the hash or size of the file... we are cheating it)
In this example what the game is doing is not exactly a "presence check" of the file... but in the practise it works like that. If the file exists the game works normally... but if you remove it the game crashes
Is almost imposible to know what the game is going to do after we remove files... so the golden rule is to never remove files