Our roving video reporter Rex Moore recently visited a real cloud in order to highlight the investing opportunities involved. Now, Rex digs deeper into the stocks involved in a five-part series with cloud expert Max Keeler. Today's installment looks at the state of storage. Solid-state memory specialists like Fusion-io (FIO.DL) and OCZ Technology (NASDAQ: OCZ) are pushing out traditional hard-drive makers. What does this mean for investors?