External devices and peripherals are non-essential components attached to computers to expand their functionality. Input devices like keyboards and mice provide data to computers, while output devices like monitors, printers and speakers share the computer's processed information. Storage devices both internal and external are used to permanently or temporarily save files and data. A history of external storage highlighted early hard drives the size of refrigerators and the introduction of USB technology that enabled smaller portable drives. Common input/output and storage peripherals along with their technologies were also examined.

1. External device and
Peripherals
Presented by:-
• Pankaj Prasad Gupta
• Chhavi Gupta
• Salman Khan
• Deepu
• Rajesh Bhaskar
• Santosh
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2. External device and
Peripherals
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3. Introduction: External device and peripherals
• External device:-
A computer interacts with the external environment via the input-output (I/O)
devices attached to it. Input device is used for providing data and instructions to
the computer. After processing the input data, computer provides output to the
user via the output device.
• Peripherals:-
The I/O devices that are attached, externally, to the computer machine are also
called peripheral devices.
The term peripheral is used to describe those devices that are optional in
nature, as opposed to hardware that is either demanded or always required in
principle.
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4. History
• The very earliest hard drives were external for all intents and purposes.
• This is because they were not mounted within the computer frame.
• These devices debuted in the late 1950s, could store 5MB of data and shipped
with the first commercially available IBM systems.
• Almost 30 years after the debut of those systems, IBM brought out the first
gigabyte drive.
• This device was the size of a household refrigerator, and was a separate unit
from the computer’s..
• Between the debut of the personal computer and the release of what a modern
consumer might recognize as an external hard drive, there were several
innovations.
• However, most of these were strictly for internal drives, as the need for an
external drive was not particularly great with early systems.
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5. History
• One of the first systems to make use of an external hard drive was Apple.
• Apple introduced the ProFile in 1983.
• Their computers often had drive bays that were difficult to access, and some had no
hard drive within them at all.
• This hard drive offered 5MB of disk space, though a 10MB was offered later as an
upgrade.
• The year was 1998, and a revolution was brewing in the computer industry. This was
the time when the USB interface was introduced to computers.
• This ground-breaking technology enabled any type of device to connect directly with a
computer from the outside, using the same type of interface.
• Previously, hard drives made use of a 40-pin connector and a power cable .
• This single technology allowed different external hard drive designs to proliferate. It
also enabled the birth of other removable media, such as the flash drive.
• The first external USB drives were bulky things, due to the technology available in
1998.
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6. About External Device
 External storage comprises devices that temporarily store
information for transporting citation needed from computer to
computer. Such devices are not permanently fixed inside a
computer.
 External drives are connected to the computer with a cable
plugged into a suitable interface such as an USB port. Data then
passes back and forth across the interface.
 The main advantage of external drives is that they are portable
and so data is easily moved from one location to another. External
drives also allow safe backup of internally stored data.
 The main disadvantage compared to an internal drive is data
transfer is slower and they also take up space around the
computer. Constant plugging in and out can also physically wear
out the port over time.
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7. About Peripherals
A peripheral device:
A hardware component that is attached to a computer in order to expand its abilities and
perform additional features.
It allows the user to interact with the computer by inputting commands, viewing the screen as
well as printing out documents and pictures.
It is “additional but not essential”, they are not part of the essential computer as are the
processor, and the memory.
Some are mounted in the same case with the main part of the computer as are the hard disk
drive or CD-ROM drive.
Other peripherals are outside the computer case, e.g. the printer and image scanner, attached by
a wired or wireless connection.
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8. About Peripherals
A peripheral can be an internal or external device.
Computer peripherals, or peripheral devices, are sometimes called "I/O devices" because
they provide input (e.g. a keyboard / mouse) and output (e.g. a monitor / printer) for the
computer.
Some peripherals, e.g. external hard drives, provide both input and output for the computer
Most devices, whether peripheral or not, require a programme called a device driver that
acts as a translator, converting general commands from an application into specific
commands that the device understands.
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9. Types
Storage device
 Magnetic storage
 Solid state storage
 Hard Disk Drive
 Optical storage devices
CD
DVD
 flash memory
Input /Output Device
 VDU
 Scanner
 Printer
 Film Recorder
 Digital Camera
 Web Camera
 Etc….
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10. Storage device
 HDD
A hard disk drive is a data storage device
used for storing and retrieving digital
information using rapidly rotating disks
(platters) coated with magnetic material.
An HDD consists of one or more rigid
rapidly rotating disks (platters) with
magnetic heads arranged on a moving
actuator arm to read and write data to the
surfaces.
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11. Storage device
SDD: solid-state drive
data storage device using integrated circuit
assemblies as memory to store data persistently.
SSD technology uses electronic interfaces
compatible with traditional block input/output (I/O)
hard disk drives, thus permitting simple
replacement in common applications.
SDs are typically more resistant to physical
shock, run silently, have lower access time, and
less latency
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12. Storage device
• USB flash drive
A USB flash drive is a data storage device that
includes flash memory with an integrated
Universal Serial Bus interface.
USB flash drives are typically removable and
rewritable, and physically much smaller than an
optical disc.
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13. External I/O Devices
The keyboard
It is an input device that allows you to enter alphanumeric data into the
computer. It also allows you to edit, correct, change, or modify existing
data.
The computer mouse
It is an input device that allows you to point to items on the monitor
in order to perform preprogrammed functions.
The computer microphone & speaker
It is an device that allows you to enter speech as data hear prerecorded
sound, or sound coming over the internet.
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14. External I/O Devices
 VDU
A monitor or a display is an electronic visual display for
computers. The monitor comprises the display device,
circuitry and an enclosure.
 Printer
A printer is an output device that prints paper documents.
This includes text documents, images, or a combination of
both.
 Web Camera
The purpose of a webcam is, not surprisingly, to broadcast
video on the Web. Webcams are typically small cameras
that either attach to a user's monitor or sit on a desk.
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15. Technology Used
 New Electric Supply Pump for High Pressure Applications Delivers Energy.
 Advanced CT scanners to reduce radiation exposure.
 The most commonly computer monitors has resolution for computer monitors
is 1920x1080.
 The most commonly computer mouse are 3D mice ,Tactile mice, Ergonomic
mice, Gaming mice.
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16. Current Technology
Input / Output Devices
Displays devices uses CRT/LED/LCD/Plasma
Microphone & Speaker, Ink-jet devices uses flow valves that control machinery
Scanners uses Optical Laser which reads bar code
Optical mouse uses coherent LASER
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17. Current Technology
 Connecting peripherals use buses/ports. USB is common to all magnetic disk
drives
 Keyboard uses Switch technology
Storage Devices
 Optical storage devices CD/DVD uses magneto-optic technology
 Storage devices use magnetic platters
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18. Future Technology
 Autostereoscopic Display – Conceptual
 Holographic Display – Conceptual
 Perceptive Pixel 27" LCD Multi-touch Display - Perceptive Pixel
Storage Devices
 Helium Drive Technology
 Ethernet Interface Kinetic Drives
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19. Refrences
www.wikipedia.org
www.google.com
www.techinfo.com
www.currenttech.com
www.slideware.com
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20. Thanks
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