Wow. Running PS2 games from an HDD with OPL is *not* trivial. PS2 games really want to read from a DVD it seems. If only I could find comprehensive documentation for HDL Dump and OPL. I'm stringing random info together for those and the hdl_dump GUI programming to see if I can resolve stutters and whatnot.
@Alex I had mixed results with pcsx2. Jak and daxter, in particular, had lots of glitches.
There's always physical media. :-)