Webopedia on Google+Webopedia on TwitterWebopedia on FacebookTech Bytes Blog
Main » TERM » O »

optical disk

A storage medium from which data is read and to which it is written by lasers. Optical disks can store much more data -- up to 6 gigabytes (6 billion bytes) -- than most portable magnetic media, such as floppies. There are three basic types of optical disks:

  • CD-ROM :Like audio CDs, CD-ROMs come with data already encoded onto them. The data is permanent and can be read any number of times, but CD-ROMs cannot be modified.
  • WORM : Stands for write-once, read -many. With a WORM disk drive, you can writedata onto a WORM disk, but only once. After that, the WORM disk behaves just like a CD-ROM.
  • erasable: Optical disks that can be erased and loaded with new data, just like magnetic disks. These are often referred to as EO (erasable optical) disks.
  • These three technologies are not compatible with one another; each requires a different type of disk drive and disk. Even within one category, there are many competing formats, although CD-ROMs are relatively standardized.







    TECH RESOURCES FROM OUR PARTNERS
    LATEST ARTICLES
    Slideshow: History of Microsoft Operating Systems

    Microsoft Windows is a family of operating systems for personal computers. In this article we look at the history of Microsoft operating... Read More »

    Slideshow: Interesting Facts About Google Search

    From Goats to Penguins, a server outage and trillions of searches, our slideshow presents interesting facts about Google and the Google.com... Read More »

    Slideshow: 5 Apps to Make Your Commute a Breeze

    We've scoured the App and Play Stores to bring you five of the most useful apps to have with you on the road, plus a bonus in-car feature. Read More »

    STUDY GUIDES
    Java Basics, Part 1

    Java is a high-level programming language. This guide describes the basics of Java, providing an overview of syntax, variables, data types and... Read More »

    Java Basics, Part 2

    This second Study Guide describes the basics of Java, providing an overview of operators, modifiers and control Structures. Read More »

    The 7 Layers of the OSI Model

    The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »