Input and output / Secondary storage

Input and output

Ergonomic Keyboard

An ergonomic keyboard is an input device that is special designed for end-user to type easily and minimize muscle strain. It's a single keyboard splits into two areas allow right and laft hands to type at a different angle. Ergonomic keyboards are high cost and it is not a common use by people because people nowadays are more get used to the straight keyboard.

Ink-jet Printer

Inkjet printers are the most widely used by people because inkjet printers are reliable, quiet, and the price is affortable to regular users. It sprays ink onto paper within high speed places extreme small droplets of ink to create image or text. The dots are usually between 50 and 60 microns in diameter which is tinier than normal human hair.

-Laser Printer

Laser pinter uses laser beam to produce images with excellent letter. It is more expensive than ink-jet printer. The laser unit fires the light reflect the mirror charge the photoreceptor drum to draw image on the paper. But unfortunately most of the laser printer only print out monochrome text and image.

-Magnetic-ink character

Magnetic-in is the technology that used to type and print out the text on the paper. Nowday it is still been used by the banking, printing checks.

-Optical-character recognition

Optical character recognition (OCR) is a wide used implement that scans image, handwritings, textbook, graph paper, and change it to the form that computer can read and change it. OCR can edit the text and copy free artifacts.

-Optical-Mark recognition

Optical-mark recognition is type of technology that can read the mark on the marking paper and recognize the locations those dots. It can only recognize 2B pencil mark. It extract the intended data from marked fields. It frequently used for test and examinations.

Secondary storage

-Disk caching

Disk caching improve the speed for disk to read or write on to a hard disk. I can be seen in the hard disk. The purpose is to increase the reading process when the operating system performs features of programs.

-File Compression

File Compression compresses data into smaller size and includes varies of files and documents. There are some widely use program can compress data like ZIP, RAR, and other program.

-File Decompression

When you use program to compress files then you also can use its function to decompress the compression.

-Internet hard drive

-Optical Disc Drive

-Solid-state storage