Monodisperse FePt nanoparticles and their superlattice arrays have shown great potential in ultrahigh density information storage applications. I will outline our efforts in synthesizing FePt nanoparticles with controlled size, composition and shape. FePt nanoparticles in anisotropic shapes are particularly important for their self-assembly into magnetically aligned structures. The talk will focus on the development in FePt nanocubes and nanorods, as well as their potential for supporting high density magnetic recording.