Units

• What is the smallest unit of data storage?

  1 bit
• 4 bits

  1 nibble
• 8 bits

  1 byte (B)
• 1,000 bytes (1,000 B)

  1 kilobyte (KB)
• 1,000 kilobytes (1,000 KB)

  1 megabyte (MB)
• 1,000 megabytes (1,000 MB)

  1 gigabyte (GB)
• 1,000 gigabytes (1,000 GB)

  1 terabyte (TB)
• 1,000 terabytes (1,000 TB)

  1 petabyte (PB)
• sound file size= sample rate * duration (s) * bit depth
• image file size = colour depth * image height (px) * image width (px)
• text file size = bits per character * number of characters
• Identify the largest file size:

  1. 2 000 000 bytes
  2. 2300 KB
  3. 200 MB
  4. 0.1 GB

  200 MB
• Identify the two file sizes that are equal to each other:

  1. 4 500 000 bytes
  2. 450 KB
  3. 4.5 MB
  4. 0.45 GB

  4 500 000 bytes & 4.5 MB
• Computers work in binary as binary represents current, whether or not current is flowing through the transistors that make up a processor.
• In a computer, all data is stored in binary form. A binary digit has two possible states, 1 and 0.
• A binary digit is known as a bit. A bit is the smallest unit of data a computer can use. The binary unit system is used to describe bigger numbers too.
• Order of units of data storage:

  • Bit
  • Nibble
  • Byte
  • Kilobyte
  • Megabyte
  • Gigabyte
  • Terabyte
  • Petabyte
• Data storage devices have different fixed capacities.