Data Dictionary - C (continued)

C

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  • Cache
  • CD
  • CDR
  • CDRW
  • CHS (Cylinder Head Sector)
  • Child
  • Clean Room
  • Client/Server Architecture
  • Clipping
  • CompactFlash
  • CompactFlash II

Cache
very similar to buffer, aimed to improve transfer speed or performance of a system or a device by storing frequently accessed information to a faster memory or storage place that could respond much faster than the primary location.

CD
Stands for Compact Disc. An optical compact disc originally developed for digital data storage. The CD disc is a plastic platter (4.75” diameter/12cm) which is now commercially used as a standard playback format for audio recordings.

CDR
Stands for CD Recordable. Recordable CD is an optical media that only allow one time writing.

CDRW
Stands for CD ReWritable. Rewritable CD allows data to be erased and write again several times.

CHS (Cylinder Head Sector)
see data addressing

Child
A process initiated by another process (the parent). This initiating action is frequently called a fork. The parent process often sleeps (is suspended) until the child process stops executing. In a tree structure, child refers to the relationship of a node to its immediate predecessor.

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Clean Room
A special work area in which air quality is concerned and sensitive to products during manufacturing or assembly process. The air in the room is regulated in term of air particles, temperature and humidity. A class 100 clean room means there exists no more than 100 particles that are larger than 0.5 microns in one cubic foot of air. Hard disk industry requires at least a Class 100 clean room for its assembly process.

Client/Server Architecture
An arrangement used on local area networks that makes use of “distributed intelligence” to treat both the server and the individual workstations as intelligent, programmable devices, thus exploiting the full computing power of each. This is done by splitting the processing of an application between two distinct components: a “front-end” client and a “back-end” server. The client component, itself a complete, stand-alone personal computer (vs. the “dumb” terminal found in older architectures such as the time-sharing used on a mainframe), offers the user it’s full range of power and features for running applications. The server component, which can be another personal computer, a minicomputer, or a mainframe, enhances the client component by providing the traditional strengths offered by minicomputers and mainframes in a time-sharing environment: data management, information sharing between clients, and sophisticated network administration and security features. The advantage of the client/server architecture over older architectures is that the client and server machines work together to accomplish the processing of the application being used. Not only does this increase the processing power available, but it also uses that power more efficiently. The client portion of the application is typically optimized for user interaction, whereas the server portion provides the centralized, multi-user functionality.

Clipping
In computer graphics, cutting off the portion of a displayed image that lies beyond a certain boundary, such as edge of a window. Certain graphics programs also support clipping as a means of masking everything but a certain objects so that painting tools, for example, can be applied to the object alone. In electronics, clipping means cutting off the peaks of a signal.

CompactFlash
A type of flash memory card for data storage devices used in portable electronic devices measuring 36.4mm x 42.8mm x 3.3mm.

CompactFlash II
A second generation of type CompactFlash cards. They are thicker and may contain a small hard drive (36.4mm x 42.8mm x 5mm).

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