释义 |
CD-ROM
CD-ROM C0181300 (sē′dē′rŏm′)n. A compact disc that functions as read-only memory.CD-ROM (-ˈrɒm) n (Electronics) compact disc read-only memory; a compact disc used with a computer system as a read-only optical diskCD-ROM (ˈsiˌdiˈrɒm) n. a compact disc on which a large amount of digitized read-only data can be stored. Compare ROM. [1985–90; c(ompact) d(isc) r(ead-)o(nly) m(emory)] CD-ROM (sē′dē′rŏm′) A compact disk containing permanently stored data that cannot be altered.ThesaurusNoun | 1. | CD-ROM - a compact disk that is used with a computer (rather than with an audio system); a large amount of digital information can be stored and accessed but it cannot be altered by the usercompact disc read-only memorycompact disc, compact disk, CD - a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laserfixed storage, read-only memory, read-only storage, ROM - (computer science) memory whose contents can be accessed and read but cannot be changed | TranslationsCD (siːˈdiː) noun (abbreviation) compact disc. 光碟(縮寫) 光盘(缩写式) CD player noun an electrical instrument for playing compact discs. 光碟播放機 激光唱机CD-ˈROM noun (abbreviation) compact disk read-only memory; a disk which stores information that can be displayed on a computer. 光碟唯讀記憶體 只读光盘驱动器CD-ROM
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 ..... Click the link for more information. .CD-ROM[¦sē¦dē ′räm] (computer science) compact-disk read-only memory CD-ROM compact disc read-only memory; a compact disc used with a computer system as a read-only optical disk CD-ROMCompact Disc Read-Only MemoryCD-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.
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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. |
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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 |
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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. |
See CD-ROMCD-ROM
CD-ROM Compact disk-read only memory Informatics A compact disk, capable of holding ± 750 MB of permanent data, which is recorded or burned only once. Cf CD-RW. FinancialSeeCDCD-ROM
Acronym | Definition |
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CD-ROM➣Compact Disk - Read Only Memory | CD-ROM➣Crazed Ducati-Riders of Massachusetts (motorcycle club) |
CD-ROM Related to CD-ROM: DVD-ROMSynonyms for CD-ROMnoun a compact disk that is used with a computer (rather than with an audio system)Synonyms- compact disc read-only memory
Related Words- compact disc
- compact disk
- CD
- fixed storage
- read-only memory
- read-only storage
- ROM
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