Compact disc read-only memory

Many database producers provide online access to thek databases or distribute thek databases on compact disc read-only-memory (CD-ROM) and so are also considered vendors or producer/vendors. Whereas numerical growth in vendors is indicated (Fig. 1), the success of the database industry is largely a result of the transition of the information industry from paper-based to computer-based services (see Computer technology Informiation RETRIEVAL, Inforitation STORAGE MATERIALS). Thus industry growth can also be measured in terms of the increase in use of computer-readable databases as exemplified by the number of searches. 

Another difference between magnetic media and CD-ROM drives is that CD-ROM drives are read-only devices (CD-ROM stands for Compact Disc-Read-Only Memory). The only way of writing to a CD-ROM is during manufacture time, where the pits are burned into the substrate of the disc. Once written, they cannot be erased. 

CD-ROM Acronym for compact disc read-only memory. A high-capacity, optical storage device that uses compact disc technology to store large amounts of information, up to 650MB (the equivalent of approximately 300,000 pages of text), on a single 4.72" disk. 

More and more information is being published in CD-ROM (compact disc read-only memory) format in addition to or instead of the traditional printed periodicals and books. The reference style follows that for periodicals and books, as appropriate, and the designation CD-ROM is included. 

Standard specifications are very important sources of chemical and occupational health and safety information. Most countries have a standardization body which prepares, organizes and promulgates national standards. It is usually the national standardization body which is represented on international bodies for standardization, thus ensuring harmonization and cooperation of action. The standards produced are usually listed in an annual catalog, which is updated by a monthly newsletter or journal. Very often the catalog will be computerized and available either online or on a compact disc read only memory (CD-ROM). 

CD-ROM compact disc read-only memory CID coating in depth... 

CD-ROM Phihps and Sony introduce the GD-ROM (compact disc read-only memory), which has the capacity to store data of more than 450 floppy disks. 

Since this paper was presented, HSELINE and CISDOC are now available on compact disc read only memory (CDROM). For information about this exciting new and easy way of accessing data from an IBM personal computer with a CD scanner, contact the HSE Enquiry Point at Sheffield. 

CD-ROM Compact Disc-Read Only Memory, disk for storing large amounts of data for personal computers, e.g today a encyclopedia with 25 volumes can be stored on one CD-ROM. 

Dithiolene complexes, and more specifically the nickel derivatives, are involved in materials used for optical data storage, such as compact disc or laser disc read-only memory (CD- or LD-ROM), and also in copiers or photography related devices. In the latter case, it is the IR-absorbing property that is exploited. Some of these compounds can be found in reviews by Mueller-Westerhoff et al. (353, 354). Recent patents are given as examples in references (458—481). In the field of optical storage, short reviews were published in 1988 (482) and 1990 (362, 483). Here, the dithiolene complexes act as inhibitors of the laser-induced fading of the colored thin layers of the optical discs. They also act as an antioxidant and increase the photostability of the cyanine dyes that constitute the recording layer. Contrary to what was observed for the two... 

The compact read-only memory disc (CD-ROM) has been developed from the compact audio disc. A 4.75 in. CD-ROM has a storage capacity equivalent to 1,500 floppy discs, or 250,000 typewritten pages. The purity of the material and the absence of internal stresses and composition variation in the discs is even more crucial than for CDs since any birefringence can cause significant loss of data. The main disadvantage of CD-ROM is that material cannot be added or erased. 

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