Pen Drive(Remove bad sectors using windows explorer)
Printers and Types
"A printer is an external output device that takes data from a computer and generates output in the form of graphics / text on a paper". There are two types of printers. 1) Impact Printers 2) Non-Impact Printers Impact printers An impact printer makes contact with the paper. It usually forms the print image by pressing an inked ribbon against the paper using a hammer or pins. Following are some examples of impact printers. 1) Dot-Matrix Printers The dot-matrix printer uses print heads containing from 9 to 24 pins. These pins produce patterns of dots on the paper to form the individual characters. The 24 pin dot-matrix printer produces more dots that a 9 pin dot-matrix printer, which results in much better quality and clearer characters. The general rule is: the more pins, the clearer the letters on the paper. The pins strike the ribbon individually as the print mechanism moves across the entire print line in both directions, i-e, from left to righ...
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