Will burned games always work?

[roster19]

I forgot to ask this earlier, how can I find out what kind of mod chip I have? The shop I bought it from closed down. I have a feeling it's a cheap swap mod. I opened the PS2, but I don't know if I should see it or if it's on the bottom. I also know that it was installed in 2002 so it ain't very new. The guy at the shop told me all these complicated instructions on cd-rs, dvd-rs, ea games. But that was such a long time ago and I've been doing a lot of work since 2002 which has made me forget how to use the mod properly.