PS2 are on DVD discs if that is what you mean. Badly scratched Game disc can make the PS2 not know the format, but it is just a bad disc
format mean style
Games on disk are UMD format, PSN games are .pkg format.
format for formal letter
you need a file with a ipd format.
When I was prompted for a format disk on ps2, I went to game stop to buy the disk. They said a disk was not available - the game was simply too scratched to play.
the game cube
JAR. and JAD.
format means to layout and specifically choose a format (text, centering or changing your data to a specific style)
cso or iso
It's a computer game
No games must be redeveloped to become a different game version. It is not just a format change