CD-ROM

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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 ?
Ages: 2 to 5 years Price: Approximately $20 Platform: Windows(R) CD-ROM Availability: Immediately at leading software retail outlets nationwide System Requirements: -- Windows(R) 95/98/2000/Me/XP -- Pentium(R) 266 Mhz -- 32 MB RAM -- 48 MB free hard disk space -- 8X CD-ROM drive -- Color monitor-16 bit (thousands of colors) with 640 x 480 resolution -- Windows compatible sound card -- DirectX 8.
fax modem, 8X CD-ROM drive, MS Windows 95 and application software in
1 compatible sound card, 8X CD-ROM, mouse and keyboard, 400MB hard drive space.
8x CD-ROM Drives, And Hot Titles From Microsoft And Activision
Minimum system requirements for Sega(R) "Hundred Swords" include a Pentium(R) II 233 MHZ, 32MB RAM, video card that supports High Color Graphics (16-bit) with 8MB of Video RAM, 8X CD-ROM, mouse and keyboard, LAN for multiplayer, 600MB free hard drive space, DirextX(R) compatible sound card, Windows(R) 95/98/ME/2000/XP operating system and DirectX(R) 8a or higher.
3gigabyte hard drive, 8x CD-Rom, 16-bit sound card, speakers, 14-inch Monitor, 28.
System requirements for the game include: Windows 95/98/Me/XP; 166 MHz Pentium processor; 16MB RAM; 130 MB available hard disk space; 16-bit color graphics video card; 8x CD-ROM drive; 16-bit Windows-compatible stereo sound card; mouse and speakers.
In addition, the Company anticipates that it will take inventory adjustment charges of approximately US$20 million due to the recent decline in market value of 8x CD-ROM drives and for the Company's first generation VL-Bus 3D graphics accelerator product.
Also featured on the system is a separate 8X CD-ROM drive, 2.
Nancy Drew: Message in a Haunted Mansion system requirements include: Windows 95/98; 166 MHz Pentium processor; 16MB RAM; 135 MB available hard disk space; 16-bit color graphics video card; 8x CD-ROM drive; 16-bit Windows-compatible stereo sound card; mouse and speakers.