Lil'Wayne

I have custom firmware on my PSP 3001, I bought a new memory stick. none of my .iso and .cso files pop up. Y?

Ok, wat i need to know is why do the .iso and .cso files not show up on in my games in my PSP, but there do on my old memory stick. Also, why doesn’t my new PSP memory stick duo have any folders at all. Like PSP, Game, etc. How can i fix this so my new memory stick as the same folders as my old memory stick? THANK YOU