Playstation 2 games download?

ok i wanna play a lot of ps2 games but sadly all of them are not available in my place, so i thought i could download it from net write it on a cd..but was advised not to from my ps2 dealer.he said the blank cds should be the silvered ones not the other colorful ones.and its not possible to find the silvered ones so easily.he said i should instead download games to a usb and then play them.now my question is how?will ps2 not ask for a cd?how do i play them through a usb?what is the procedure?please help