Philips BD-RE 25GB 2X Blu-ray rewritable disc offers 25 gigabytes of storage capacity. It records, rewrites and playbacks high-definition video (HD), as well as storing large amounts of data. A single-layer Blu-ray disc can hold 25GB, which can be used to record over 2 hours of HDTV. Blu-ray uses a blue-violet laser to read and write data. Philips, the inventor of the CD/DVD technology also the Blu-ray standards committee member offers high-quality, highly reliable qualified media.