In this paper, we propose an interactive DTV design that converts non-interactive broadcast DTV streams into interactive ones for multiple simultaneous viewers. To enable viewing interactivity, we show that it is critical to organize data intelligently for improving IO resolution, reducing disk latency and minimizing storage cost. We propose three data placement schemes that offer different tradeoffs between IO resolution, disk latency and storage. By employing different schemes under different workload scenarios, an intelligent system can minimize memory use and hence the system cost.