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
    8 Agenda Apps to Help Students Stay Organized

    Webopedia's student apps roundup will help you to better organize your class schedule and stay on top of assignments and homework. Read More »

    List of Free Shorten URL Services

    A URL shortener is a way to make a long Web address shorter. Try this list of free services. Read More »

    Top 10 Tech Terms of 2015

    The most popular Webopedia definitions of 2015. Read More »

    STUDY GUIDES
    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 »

    Computer Architecture Study Guide

    This Webopedia  study guide describes the different parts of a computer system and their relations. Read More »

    What Are Network Topologies?

    Network Topology refers to layout of a network. How different nodes in a network are connected to each other and how they communicate is... Read More »