[hx8]

I'm very disappointed in the lack of details about the patcher. Not only does it not provide any insights into how the process works, it also doesn't even include all the relevant information on what the process works on. I assume it works on PS2 DVD games, but does it work on PS2 CD games, or PS1 games?

[IronBacon]

The details are explained on the Cturt blog mentioned in another post, the original researcher, this one seems a GUI to simplify the process of patching ISO.

About your questions, I would guess transforming PS2 CD title to PS2 DVD first could work.

For PS1 titles, with a different exploit (mechapwn) you could boot them, but read the fine prints as it basically convert a consumer PS2 to a devkit/testkit (DEX?)...