CD-ROM

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Related to CD-ROM player: CD-ROM drive

CD-ROM:

see compact disccompact disc
(CD), a small plastic disc used for the storage of digital data. As originally developed for audio systems, the sound signal is sampled at a rate of 44,100 times a second, then each sample is measured and digitally encoded on the 4 3-4 in (12 cm) disc as a series of
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.

CD-ROM

[¦sē¦dē ′räm]
(computer science)

CD-ROM

compact disc read-only memory; a compact disc used with a computer system as a read-only optical disk

CD-ROM

CD-ROM

(Compact Disc-Read Only Memory) A type of CD disc that can only be read, but not recorded. Used to store programs and data files, a CD-ROM holds 650MB or 700MB of data and employs a different recording format than the audio CD (CD-DA), from which it evolved. In the 1990s, the CD-ROM rapidly replaced the floppy disk for software distribution.

An audio CD player cannot read CD-ROMs, but CD-ROM drives can play audio discs. In practice, the term "CD" refers to all CD formats. The phrase "insert the installation CD" really means "insert the installation CD-ROM."

How CD-ROMs Are Made
CD-ROMs are made by "burning" a blank CD-R disc and sending it to a media manufacturer, which creates a master disc that is used to stamp out the required quantity. See CD-R and mini CD.

Pretty Slow in the Beginning
Back in the late 1980s, the first CD-ROM drives transferred data at 150KB per second. By doubling the spindle speed from 530 to 1,060 RPM, the transfer rate doubled to 300KB (2x). For several years thereafter, speeds increased until reaching 48x and higher, making the "1x" drive painfully slow by comparison. For details about speeds, see CD-ROM drives. Access times range from 80 to 150ms. See CD-R, CD-RW, DVD and optical disc.


Caddy Load and Tray Load
Earlier drives used a caddy. The disc must be inserted into the caddy, and the caddy inserted into the drive. Today, drives are caddyless. The disc is placed into a tray.




Caddy Load and Tray Load
Earlier drives used a caddy. The disc must be inserted into the caddy, and the caddy inserted into the drive. Today, drives are caddyless. The disc is placed into a tray.







Reading CDs and CD-ROMs
Digital data are carved into the disc as pits (low spots) and lands (high spots). As the laser shines into the moving pits and lands, a sensor detects a change in reflection when it encounters a transition from pit to land or land to pit. Each transition is a 1. The lack of transitions are 0s. There is only one laser in a drive. Two are used here to illustrate the difference in reflection.







References in periodicals archive ?
I also prefer an external CD-ROM player to one that's built into your computer.
Kodak, for instance, is promoting a photo CD; this device is much simpler than a CD-ROM player and could replace the slide projector as the standard for presentations.
For advanced aficionados, a read/write CD-ROM player that enables images to be transferred from the hard drive to the CD-ROM player.
Does your equipment include a printer, fax, copier, CD-ROM player and more?
Pippin is basically a CD-ROM player that attaches to a television set and comes with a modem attachment.
Corel Professional Photos on CD-ROM can be read by any CD-ROM player as XA support is not required.
Multimedia: You need a CD-ROM player and sound system to take advantage of the explosion in multimedia games, entertainment, reference works, on-line offerings and even business programs.
The Interaxx Home Station combines multimedia PC architecture, CD-ROM player to deliver content, and printer.
Bandai's Pippin CD-ROM player converts a television into a high-resolution, multimedia computer that plays a wide variety of Macintosh compatible CD-ROM software.
8 offers hybrid CD support, allowing users to create CDs that can be read on a Mac or PC with a CD-ROM player, or an audio CD player.
Introduced in November 1994 at the COMDEX/Fall exhibition, PD is the world's first storage device to combine a rewritable 650MB phase change optical disk and quadspeed CD-ROM player in one dual-function drive.
Research shows that there is a strong correlation between home PC usage and music listening, and indeed many home PC users already listen to music via their PC -- either using the CD-ROM player or via the internet.