I Found 2 PlayStation 2 PAL Demo Discs, they boot up but the startup screen is corrupted, i should dump them? Official PS2 Magazine Demo 1 Games (2000) : 2004 Disc:
The Disc is scratched, but only the PlayStation 2 logo during startup is corrupted, everything else is fine, but some videos on the disc aren't working, i need to test on My Real PS2, che screenshot are from my Windows 10 PC
First rule, dump it as it. Set the the read retry very high. Then clean it a bit, do it again. Lastly, polish it and try again. If you polish it, you need to protect the top so it doesn't damage. Last time I did this I mounted the disc label side down using a plastic retainer through the hole and buffed it carefully with polishing compound. You don't want the disc to spin at all.
This is a good way to destroy the disc. Set the retry to low or none (or even to "Abort on error"). If the drive cannot read a sector, then retrying more than once or twice is futile. If you set read retries too high, the drive will put too much strain on the disc, potentially enough to crack it. Just make multiple dumps that way and MD5 compare them at the end. If the hashes match, your dump is as good as the drive can read it. If they don't, something went wrong.
If you're running PAL discs on NTSC consoles or the opposite, you will *ALWAYS* get a corrupted "PlayStation 2" logo. The logo for PAL consoles are in a different resolution. Edit: Screw modchips.