An input/output device is also known as storage device. These computer devices preserve information for retrieval. In other words, an storage device is capable of storing data. The term usually refers to mass storage devices, such as disk and tape drives.

There are two types of storage devices used in computers; a ‘primary storage’ device and a 'secondary storage’ device....

An output device is any peripheral that is connected to a computer and used to transfer data out of the computer in the form of text, images, sounds or other media to a display screen, printer, loudspeaker, or storage device.

Examples of output devices are:
Monitor
Printer
Sound card
Speakers
Video card
Buzzers
Loudspeakers...

An output device receives information from the computer and translates it from machine language to a form that humans can read or so that another machine can read the information. An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.

Electronic output devices can be mechanical, audio, or visual. Mechanical outputs include motors, solenoids, and other electromagnetic devices. Audio outputs include buzzers, loudspeakers, piezo transducers, and ultrasonic transmitters. Mechanical and audio outputs tend to have a higher power demand than other output devices. Visual outputs include lamps, LEDs (light-emitting diodes), and infrared transmitters....