yeah, the earlier games were all on DVD format, but the "blue" disks aren't on that format. When Sony first released the PS2 they were expecting to only use games that were on DVD format, but then game companys started releasing games that were not on that format and sony started to change the way the PS2s were made. So the first few makings of the PS2 were made without the ability to read the disks that werent on DVD format. At least thats what i read somewhere. And if you can remember the first year or so of the regular playstation had problems too.
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