Or you could try PS2ESDL, since it's tuned for USB device support: http://psx-scene.com/forums/f253/pla...ps2esdl-63375/ (Playstation 2 External Storage Device games Loader (PS2ESDL))
Performance and compatibility seems to be a little better compared with some games to OPL.
To use any loader or any homebrew software in particular, you need to already have a way to launch them.
If you don't have a modchip that supports DEV1 booting, you should probably opt for Free MC Boot (FMCB).
FMCB is a program that exploits the OSDSYS (browser) update mechanism found (And functioning) in all PS2 models up to the SCPH-90000 series consoles with BIOS v2.20.
With FMCB, you can launch homebrew software without the need of any discs. Just insert your memory card containing FMCB before switching on the console and you can launch homebrew software.
If you want, you could try FMCB v1.8C instead of 1.8B, since 1.8C consumes a little less space and is a little faster at bootup than v1.8B: http://psx-scene.com/forums/f153/uno...staller-96372/ (Unofficial FMCB v1.8C installer)
If you console does not have a modchip and you do not have any other means of starting the FMCB installer, FMCB v1.8C is useful if you can get access to another PS2 that can run homebrew. FMCB v1.8C is region-free.
As for your disc burning problem, your console must be already able to play burned games. In other words, it has to already have a modchip installed, or you have to use ESR.
And you should use high-quality discs. For DVD-R games, use Verbatim DVD-R discs that were manufactured by Taiyo Yuden or Mitsubishi.
I heard that Sony CD-R discs are the best for CD-ROM games.
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit