Discussing the Raman processes in disordered carbons, according to Ferrari and Robertson, "the visible Raman spectrum depends fundamentally on the ordering of sp 2 sites and only indirectly on the fraction of sp 3 sites". The researchers continue presenting a "three-stage model relating the visible Raman parameters to the sp 2 nanostructure and content of disordered carbons". The Section III of their work is dedicated to the vibrational modes, and in its Figure we can find the vibrational density of states, VDOS, of graphite (in fact, of a single layer graphene) and of diamond. "Graphite has a higher VDOS band limit than diamond because the sp 2 sites have stronger, slightly shorter bonds than sp 3 sites". Then, the VDOS of DLC is discussed, such as the related consequences on Raman spectra.