The pre-formatted, dual layer, 50GB Rewritable Optical Disc from Sony is capable of recording up to 185 minutes of standard definition content and 122 minutes of high-definition content in MPEG mode at 18 Mbps. This optical disc is comprised of durable and re-usable media allowing it to be used under a variety of environmental conditions. Once the information is recorded, the estimated 50-year shelf life of this optical disc provides added peace of mind that the content will remain safe for a long time to come.