Which is why others have asked you for the log file so they can see the media code those disc's have or have faked.
Ps2 is as already mentioned very picky with media, having a crap laser does not help it either.
which way is the ps2 loading thru swap magic or dedicated chip ?
If swap magic that may be your problem and not the disc, try zoneloader if so.
Or try some other media, preferably good like suggested taiyo yuden or verb mcc
Perhaps it maybe bad media. I bought it when I went back to Asia so I guess it's not some American known brand. However, using that disk I'm able to back up another game though which is why I wonder why it wouldn't work for this one. My PS2 is already modded so I don't need swap magic.