Information and Communication Technology

2.1.2 Input Unit

An input unit presents data to the processing unit in machine-readable form . Although the keyboard is a common input unit for a small computer, a system may also support one or more of the input units.

Common input devices

No.	Device	Medium of data storage	Remarks
1.	Optical character reader (OCR)	Special paper document	Only input
2.	Magnetic ink character recogniser (MICR)	Special paper document	Only input
3.	Mark sense reader	Special paper or card	Only input
4.	Graphics tablet	Document	Only input
5.	Mouse	Document	Only input
6.	Floppy drive	Floppy disk	Input, output, storage
7.	Hard disk (Winchester) drive	Magnetic disk	Input, output, storage
8.	Tape drive	Magnetic disk	Input, output, storage
9.	D-ROM drive	Optical disk	Input, storage