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MyIGNOU – A Blog for IGNOU Students 2016. CD-R discs are blank CDs that can record data written by a CD burner. The word “recordable” is used because CD-Rs are often used to record audio, which can be played back by most CD players. However, many other kinds of data can also be written to a CD-R, so the discs are also referred to as “writable CDs.
The data burned onto a CD-R disc is permanent, meaning it can not be altered or erased like the data on a hard drive. Typically, once a CD has been burned, it will not be able to record any more data. A screen display technology developed in 1963 at the David Sarnoff Research Center in Princeton, NJ. How LCDs work is quite amazing. Sandwiched between polarizing filters and glass panels, rod-shaped molecules of liquid crystals flow like water and bend light like crystal.
The overwhelming majority of TVs and computer screens are LCD. The toner adheres to the charged image on the drum. The toner is transferred onto a piece of paper and fused to the paper with heat and pressure. After the document is printed, the electrical charge is removed from the drum and the excess toner is collected. Most laser printers print only in monochrome.
A color laser printer is up to 10 times more expensive than a monochrome laser printer. A graphics card is a type of display adapter or video card installed within most computing devices to display graphical data with high clarity, color, definition and overall appearance. A graphics card provides high-quality visual display by processing and executing graphical data using advanced graphical techniques, features and functions. A graphics card is also known as a graphics adapter, graphics controller, graphics accelerator card or graphics board.