Abbreviated as CDP and also called continuous backup, continuous data protection refers to backing up computer data by saving as an automated function a copy every time changes are made to that data. It allows users to restore files that are corrupted or that have been accidentally deleted, back to any point in time before they were lost.
There are three types of CDP systems:
Block-based CDP: logical time-ordered cache of all block-writes across the storage network.
Application-based CDP: operates from within the specific application being protected.
File-based CDP: capture file-system data and metadata events.
- continuous-form paper
A type of printing paper which consists of a single sheet or roll of paper, normally perforated at regular intervals so that sheets can be easily separated. Most continuous-form paper has holes punched along each side so that the paper can be pulled through the printer by a tractor-feed mechanism.
- continuous tone
Refers to images that have a virtually unlimited range of color or shades of grays. Photographs and television images, for example, are continuous-tone images. In contrast, computer hardware and software is digital, which means that they can represent only a limited number of colors and gray levels. Converting a black-and-white continuous-tone image into a computer […]
- contone printer
A type of printer that uses a combination of dithering and printing at different levels of intensity to produce different colors and different shades of lightness and darkness. Unlike a true continuous-tone printer, contone printers can lay down at ink at only a few different levels of intensity (usually 8). To produce the full range […]
- contrast ratio
In reference to computer monitors, the measurement of the difference in light intensity between the brightest white and the darkest black. Contrast ratio is often used in marketing computer monitors, where a high contrast ratio, such as 400:1, represents a better color representation (the better the information will appear against a darker background) on the […]
Formed from the words compressing and expanding. A PCM compression technique where analog signal values are rounded on a non-linear scale. The data is compressed before sent and then expanded at the receiving end using the same non-linear scale. Companding reduces the noise and crosstalk levels at the receiver.