A CD-ROM is a Compact Disc with Read Only Memory. Compact disks are storage devices for media which can contain Pictures and Music but cannot be modified. They are mostly popular because of their use for distributing Computer Games and Applications. The first CD-ROM's date back to 1985. At first, these devices had much more memory capability than a hard drive but now it's the opposite. Though there are Holographic Versatile Discs under development which will contain much space for storage, no CD or CD-ROM device contains more memory than a Computer.
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