Help needed -New 4gb stick, 3.10 OE-EA and ISOS

Ok i just bought a new san disk 4gb mem stick. I transfered all my ISOS TO my memory stick after formatting the stick. I put them as usual in the 'ISO' folder in the root of the psp yet however when on the xmb i cant find them in the usual place. However homebrew seems to work fine. Any ideass on how i can fix my little problem. much thanks

ISO discussion is not allowed at DCemu, go elsewhere for that sort of thing or better yet actually buy your games.