Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 18 • Digital Video Express • Fluorescent Multilayer Disc • GD-ROM • Phase-change Dual • Universal Media Disc 12.3 Third-generation optical discs Major third-generation optical discs are currently in development. They will be optimal for storing high-definition video and extremely large video games. • Blu-ray Disc • Enhanced Versatile Disc • Forward Versatile Disc • Holographic Versatile Disc • HD DVD • Ultra Density Optical • Professional Disc for DATA • Versatile Multilayer Disc 13 Secondary storage In computer storage, secondary storage , or external memory , is computer memory that is not directly accessible to the central processing unit of a computer, requiring the use of computer's input/output channels. Secondary storage is used to store data that is not in active use. Secondary storage is usually slower than primary storage , or internal memory, but also almost always has higher storage capacity and is non-volatile, preserving the stored information in an event of power
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DVD, Blu-ray Disc, Optical disc, primary storage, HD DVD, third-generation optical discs