2.3 Units

• What is the purpose of storing data in binary format?

  Data must be stored in binary format to be processed by a computer
• How is the size of a text file calculated?

  Text file size = bits per character x number of characters
• What number system do all computer systems use to communicate, process, and store data?

  Binary
• Why do computers use binary?

  Because computer systems consist of billions of tiny transistors that have two values: on (1) or off (0)
• What types of data must be converted into binary format for processing?

  Text, images, videos, and audio
• What is a single bit?

  A single bit is a 0 or a 1
• What is a nibble?

  4 bits
• How many bytes are in a kilobyte?

  1,000 bytes
• What can a kilobyte store?

  A kilobyte can store a short email
• How many bits are in a byte?

  8 bits
• How many kilobytes are in a megabyte?

  1,000 kilobytes
• What can a megabyte store?

  A megabyte can store about a minute of music
• How many megabytes are in a gigabyte?

  1,000 megabytes
• What can a gigabyte store?

  A gigabyte can store about 500 photos
• How many gigabytes are in a terabyte?

  1,000 gigabytes
• What can a terabyte store?

  A terabyte can store about 500 hours of films
• How many terabytes are in a petabyte?

  1,000 terabytes
• What can a petabyte store?

  A petabyte can store about 1.5 million CDs
• What is the difference between kilobytes and kibibytes in terms of bytes?

  • 1,000 bytes = 1 kilobyte
  • 1,024 bytes = 1 kibibyte
• Why is it important to calculate required storage capacity for data?

  To ensure that there is enough space for the data being stored
• If a USB memory stick has a capacity of 32GB and 9GB of space remaining, how many songs of 6MB each can be stored?

  1,500 songs
• How do you convert 9GB to megabytes?

  9GB x 1000 = 9000MB
• If Tim has a hard drive with 25GB of space and each video file is 200MB, how many files can he fit on the hard drive?

  125 files
• If Samantha has 1.2GB of free storage and each song is compressed to 900KB, how many songs can she fit on her USB stick?

  1,333 songs
• How many 0.2GB audio files can be stored on a CD with a capacity of 650MB?

  3 files
• What are the key data storage units in order from smallest to largest?

  • Bit
  • Nibble
  • Byte
  • Kilobyte
  • Megabyte
  • Gigabyte
  • Terabyte
  • Petabyte
• What are the key data storage units in order from largest to smallest?

  • Petabyte
  • Terabyte
  • Gigabyte
  • Megabyte
  • Kilobyte
  • Byte
  • Nibble
  • Bit
• What is the significance of the 1,024 vs. 1,000 bytes in data storage calculations?

  • 1,000 bytes = kilobyte (for simpler calculations)
  • 1,024 bytes = kibibyte (more precise)
• What is the importance of understanding data storage units in computing?

  • Helps in estimating storage needs
  • Aids in understanding file sizes
  • Essential for managing data effectively