From a technical perspective, the biggest advantage Blu-ray discs (BD) offer is more storage space–up to 25GB (for single-layer discs) or 50GB (for dual-layer discs). From a more practical standpoint, the best thing BD brings to the table is higher-quality, high-definition (HD) movies. More storage space means less data needs need to be compressed to fit on the disc–which is how we’re able to get 1080p BD movies. But what happens when Quad HDTV (3840×2160 resolution: 2160p) makes its debut in a few years?