just a thought
but if USB advance can play games through an external HD unit in the USB slot, is it at all possible to use an external dvd drive in the USB slot to play back-ups in? This would help with games that dont work in HDLoader/USBadvance but the PS2 has a gubbed laser (in my case)
Take it one step further.....
What about a USB cable from PC to PS2 with a server on the PC streaming the iso over to the PS2 for playing ?