There is no such thing as a "format disc."
If you got a message when you turned on your PlayStation One, it means it needs a disc that is of PS1 format.
You must make sure that:
1) The game is from the same country as the game itself.
2) Not a copy.
If you are having problems with a disc that you bought from a store, you PS1 is damaged, the disc is damaged, the disc is dirty, or the lens on the laser of your PS1 is dirty.
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Check the back of a disc there might be a scratch on it. If not it might just be your PlayStation is having trouble reading the disc. Finally maybe your PlayStation is having problems.
The Playstation 3 Backward Compatibility depends on the model number of the Playstation 3. In general for Playstation 1 games they say that the PS3 will some Playstation Format Software on the System. The related link provides detailed information by individual model
.CSO is a compressed file format, generally used on PlayStation Portable games.
You can not play PlayStation 3 games on a PlayStation 1, but you can play PlayStation 1 games on a PlayStation 3. All of the PlayStation consoles are backwards compatible.
No. Because The Playstation 1 Is Too Old.