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Lecture 3. Storage units , output , output units. Storage units. used to store data at the request of the user , the units do not lose their contents when you turn off the device or power Outages. Main.

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lecture 3

Lecture 3

Storage units , output ,output units

storage units
Storage units
  • used to store data at the request of the user, the units do not lose their contents when you turn off the device or power Outages
slide4

Main

  • Consists of several hard disk drives and this explains its ability to absorb a large amount of data.
  • storage capacity of up to more than 400 GBYTE
  • HDD
slide5

Main

  • Floppy disk consists of only one disk and this explains to absorb a small amount of data.
  • the maximum storage capacity is 1.44Mbyte.
  • FDD
slide6

Main

  • CD consists of material reflecting the light، the data is stored by using lasers.
  • used for read-only and cannot add data to it only through a special device to write the so-called CDWriter.
  • storage capacity of up to 750MBYTE.
  • CDROM drive
slide7

Secondary

  • Similar to the floppy disk in terms of shape and has a drive motor is similar to the floppy disk.
  • it is characterized by a capacity of storage medium.
  • ZIP Drive
slide8

Secondary

  • small-sized storage units .
  • connected through the ports of USB .
  • capacity of up to more than 32MByte.
  • Flash memory
slide9

Secondary

  • External drive the largest in terms of storage capacity, cost and size.
  • External HDD
input units
Input units

Input unit

Enter and deliver the data to be processed to the CPU .

Ex:

  • Keyboard.
  • Mouse.
  • Scanner.
  • Bar code reader.
  • Joy stick
output units
output units

Output units

Directed by which the data have been processed when the user requested

Ex:

  • Monitor .
  • Printer.
  • Speaker.
input output at the same time
input, output at the same time

Touch screen

Is a unit display data (text, images) and at the same time to receive orders and options by clicking on it by the finger or a special pen

units of measurement capacities in the computer
Units of measurement capacities in the computer
  • Represent the data within the computer using binary digital data(0,1).
  • BIT is one of the two cases (0,1)
units derived from bit
Units derived from BIT
  • Byte=8Bit
  • Kbyte=1024Byte
  • MByte=1024Kbyte
  • GByte= 1024MByte
units used to measure the capacity of storage media
Units used to measure the capacity of storage media
  • Capacity is measured in bytes of storage media and Derivative
units of measure processor speed
Units of measure processor speed
  • Processor speed is measured through the unity of electrical frequency (Hz) and derivatives
  • 1MHZ= 1000HZ
  • 1GHZ=1000X1000HZ=1000MHZ
the units measure the speed of the motherboard
The units measure the speed of the motherboard
  • Measured the speed of the motherboard through the unit Hz.
  • the speed of the so-called BUS
slide18
Note

When increasing the speed of the motherboard and processor and memory capacity of RAM and hard drive capacity increases the efficiency of the computer

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