1. INPUT, OUTPUT AND STORAGE DEVICES6
INPUT, OUTPUT AND STORAGE DEVICES
Payam Wali
Information Technology Dept.

2. Objectives Input Devices Keyboard Touch Screen Graphics Tablet Webcam
Scanner, Joystick, Mouse
Output Devices
Monitor, Printer, Speaker, Headphones
Data Storage Devices

3. INPUT, OUTPUT AND STORAGE DEVICES

4. Input Devices
Input devices are peripheral devices that enter data and instructions into the computer.
A mouse and a keyboard are the most used input devices. Other common input devices are scanners, microphones, graphics tablets, digital cameras, touch screens, and joysticks.

5. Keyboard
The keyboard is the most common way to enter information into a computer.
Today, standard keyboards have 104 or 105 keys. An electronic circuit inside the keyboard transmits the code of a pressed key to the CPU.

6. Keyboard
Parts of Keyboard

7. Keyboard
Most of the keys on a keyboard are used to enter numbers, letters, and punctuation marks.
There are also function keys (used for special functions in applications), keys for working with text and documents (for example, the Page Up and Page Down keys), and other keys used to make special key combinations (Alt and Ctrl).
There are some different arrangements of alphabetic, numeric, and punctuation symbols on keys.
These different keyboard layouts exist due to different languages.

8. Keyboard Layouts QWERTY :Common layout.
• QWERTZ : Used in Germany, Hungary and Czech Republic
• AZERTY : It is used by most French speakers based in Europe
• DVORAK : Alternative for QWERTY, Dvorak layout uses less finger motion, increases typing rate, and reduces errors compared to the standard QWERTY

9. Keyboard
QWERTY is the most used modern-day keyboard layout on English-language computers.
It takes its name from the first six letters at the upper left of the keyboard.
Many modern keyboards have extra keys for accessing music, web, and other frequently used programs and features, such as a mute button, volume buttons, or a sleep button.

16. KEY BOARD SHORTCUTS CTRL + Q = Quit (Exit a Program)
CTRL + W = Close Window
CTRL + A = Select All
CTRL + S = Save
CTRL + F = Find
CTRL + Z = Undo
CTRL + X = Cut
CTRL + C = Copy
CTRL + V = Paste
CTRL + P = Print
ALT + TAB = Switch windows
CTRL + ALT + DEL = Will bring up a menu allowing you to shut down, restart, or log off your computer.

17. Touch Screen
Touch Screen is a type of display screen that has a touch-sensitive transparent panel covering the screen so that it can recognize the location of a touch on its surface.

18. Touch Screen
Using a touch screen with fingers (A touch screens found in the malls for store search)

19. Using a touch screen with a pen (stylus)

20. Graphics Tablet (Pen Tablet)
A tablet is an alternate type of input device that can be used in place of a pointing device. It enables you to enter drawings and sketches into a computer.
The tablet consists of two parts, a flat surface for drawing and a pen or stylus that is programmed to work with the tablet. The graphics tablet is most suited for artists and those who want the natural feel of a pen-like object to manipulate the cursor on their screen.

21. Graphics Tablet (Pen Tablet)
Who uses graphics tablets?
Architects and Engineers
Artists
Cartoonist
Fashion designers
Graphic designers
Illustrators
Photographers
Teachers

22. Graphics Tablet (Pen Tablet)

23. Graphics Tablet (Pen Tablet)

24. Webcam
A webcam is essentially a small camera that is connected to a computer, either directly or wirelessly, and gathers a series of images that are viewed in real time on the computer screen or over a network, especially over the Internet.
Because it allows for cheap real-time communication from anywhere in the world, webcam technology is widely used by all sorts of people for all sorts of different reasons.

25. Webcam
Friends and relatives use webcams for video chat, and businesses use webcams for online video conferencing; in security and gaming, webcams are used for motion detection.

26. Scanner
A scanner uses special light sensors to capture an image printed on paper and translate the information into a form the computer can use.
You can then use special text or graphics software to work with the scanned image.
To edit text read by an optical scanner, you need an optical character recognition (OCR) system to translate the image into ASCII characters.

27. Joystick
A joystick is a pointing device consisting of a stick-like object attached to a base that can be pushed in four or more directions. It controls the movement of a pointer or some other display symbols.
A joystick is similar to a mouse, except that, with a mouse, the cursor stops moving as soon as you stop moving the mouse.

28. Mouse
A mouse is the most common input device along with the keyboard. It is used to point to things and select things on the screen. It functions by detecting two-dimensional motion relative to its supporting surface.
You use your mouse whenever you want to move your cursor or activate something. Your mouse senses your motion and your clicks and sends them to the computer so it can respond appropriately. The mouse’s motion typically translates into the motion of a pointer on a display, which allows for fine control of a GUI (Graphical User Interface).

29. Five basic actions of the mouse
Click: Press and release the left mouse button.
Right-Click: Press and release the right mouse button.
Double-Click: Press and release the left mouse button twice rapidly.
Drag and Drop: Press and do not release the left mouse button, then move the mouse with the button still held down, and finally release the button.
Scroll: Many mice have a scroll wheel between the left and right buttons.

30. Touchpad and TrackPoint are two alternative pointing devices for mice that are usually found on laptop computers

31. Output Devices Monitor
Output devices are peripheral devices that output information that has been held or generated within a computer.
Because most information from a computer is output in either a visual or auditory format
Monitor
A monitor or computer screen is a very common type of output device.
A monitor displays images that have been generated by the computer’s video card. The monitor is attached to the video card by a cable.

32. There are two main types of monitor: flat panel monitors and cathode ray tube (CRT) monitors.
A flat panel monitor uses a liquid crystal display (LCD) instead of a cathode ray tube to display data. LCD monitors occupy less space, consume less energy, and are much lighter than CRT monitors.
Many monitor companies have already stopped producing CRT monitors.

33. Printer
A printer is an output device that prints text and computer-generated images onto paper or onto another physical medium, such as a transparent film.
Printers can print in monochrome or color mode. There are many types of printers on the market to meet users’ demands.
Depending on the printing technologies, printers are divided into three main categories: Dot matrix, ink-jet, and laser printers.

34. Printer Types

35. Speakers and Headphones
A speaker is an output device that plays sound generated by the computer’s sound card. The speaker is attached to the sound card by a cable. Most computers also have an internal speaker that is attached to the mainboard and that can play simple sounds.

36. Speakers and Headphones
A headphone is a pair of speakers worn over or in the ears so only the wearer can hear the sound.
A headphone with an integrated microphone is usually called a headset.

37. Data Storage Devices
A storage device is a hardware device designed to store and retrieve information.

38. Depending on the technology, storage devices can be divided into three categories: magnetic, optical, and flash storage.

39. Depending on the technology, storage devices can be divided into three categories: magnetic, optical, and flash storage.

40. Data Storage Devices
The building blocks of digital images are bits, which can either be 0 or 1.
Magnetic storage devices such as hard disks distinguish a one from a zero by changing the magnetic properties of the disk in that location.

41. Data Storage Devices
In an optical medium, data are recorded by making marks in a pattern that can be read back with the aid of a tiny beam of laser light precisely focused on a spinning polymer disc.

42. Hard Disk Drive

43. Hard Disk Drive
A hard disk drive (HDD), commonly referred to as a hard drive is a device that stores digitally encoded data on rapidly rotating platters with magnetic surfaces.
Hard disks are the main large data storage area inside your computer. Hard disks are used to store your programs and data.
They are much faster than most other types of storage device and can also hold much more data.

44. Components of a hard disk drive

45. Hard Disk Drive

46. Hard Disk Drive
The hard disk platters spin round underneath the disk head so that the computer can read the data tracks.
A hard disk drive has a speed between 4500 and rpm (revolutions per minute), which means that the platters spin round between 4500 and times every minute.

47. Solid-State Drive (SSD)
A solid-state drive is a storage device that uses solid-state memory to store data.

48. Solid-State Drive (SSD)
Solid-state drives contain no moving parts.
Data are split into word-length pieces and stored in memory.
They are then accessed almost instantaneously using unique system-wide addresses.

49. Solid-State Drive (SSD)
This behavior has been used in computer RAM for many years, but for a long time it was too expensive for using as a permanent storage solution.
Solid-state technology is used in portable storage devices (USB flash memory, portable hard disk drives) and permanent storage devices (internal hard drives).
A USB flash drive is a flash memory data storage device integrated with a USB interface.

50. Floppy Diskette (FDD) Zip Disk
Floppy disks are also called diskettes. They are very slow compared to hard disks or CD-ROMs and hold a smaller amount of data (1.44 megabytes).
Zip Disk
Zip disk looks like a floppy disk, but it can hold a lot more data (100 MB, 250 MB, or 750 MB). Zip disks can only be read by a special drive called a Zip drive.

51. Optical Disc Drive

52. Optical Disc Drive
An optical disc drive uses laser light or electromagnetic waves within or near the visible light spectrum as part of the process of reading or writing data to or from optical discs.
Optical drive is the generic name; drives are usually described as "CD" "DVD", or "Blu-ray", followed by "drive", "writer", etc.

53. Capacities of Some Common Optical DiscsCD
DVD
DVD Dual Layer
Blue Ray
Blue Ray Dual Layer
Capacity
700 MB
4.7 GB
8.5 GB
25 GB
50GB