OK so i got a new PS2 slim (SCPH-90006), and i've spent all night scouring ps2 exploit and hacking sites, burning my rewritable discs to make my ps2 boot from the memory card.
So far its a fail.
Although I do have made some progress and been able to write some ps2 games to my USB Flash drive 4GB, and then make another bootable disc of USBAdvance and now i can see the games from USB when i boot the ps2 with USBAdvance cd.
Since the bad habit i have, i'm gonna keep trying different ways untill my ps2 bows to me :P
i'll be constantly updating this thread.
May be in the end this thread my be of use to anybody with a PS2 slim wanting to run backups without the game discs inside. (The ps2 slim hdd installation guide is severely short in the stickies so i hope i can add something that might elaborate the process a bit more)
If you own a ps2 slim and have anything to suggest, please do so. thanks