Units

• What is the primary number system used by computers?

  Binary
• Why must data be stored in binary format?

  Because computers process data using binary
• What is a bit?

  A single 0 or 1
• How many bits are in a byte?

  8 bits
• What is a nibble?

  4 bits
• How much data can a kilobyte store?

  A short email
• How many kilobytes are in a megabyte?

  1,000 kilobytes
• What can a megabyte approximately store?

  About a minute of music
• How many megabytes are in a gigabyte?

  1,000 megabytes
• How many photos can a gigabyte store?

  About 500 photos
• How many gigabytes are in a terabyte?

  1,000 gigabytes
• How much data can a terabyte approximately store?

  About 500 hours of films
• How many terabytes are in a petabyte?

  1,000 terabytes
• How many CDs can a petabyte store?

  About 1.5 million CDs
• What is the relationship between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes?

  • 1 bit = 0 or 1
  • 1 byte = 8 bits
  • 1 nibble = 4 bits
  • 1 kilobyte = 1,000 bytes
  • 1 megabyte = 1,000 kilobytes
  • 1 gigabyte = 1,000 megabytes
  • 1 terabyte = 1,000 gigabytes
  • 1 petabyte = 1,000 terabytes
• How many songs can be stored on a USB stick with 9GB remaining if each song is 6MB?

  1,500 songs
• How many files can Tim fit on a hard drive with 25GB of space if each file is 200MB?

  125 files
• How many songs can Samantha fit on her USB stick with 1.2GB of free storage if each song is 900KB?

  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 points regarding data storage units and their conversions?

  • 1 byte = 8 bits
  • 1 nibble = 4 bits
  • 1 kilobyte = 1,000 bytes
  • 1 megabyte = 1,000 kilobytes
  • 1 gigabyte = 1,000 megabytes
  • 1 terabyte = 1,000 gigabytes
  • 1 petabyte = 1,000 terabytes
• What is the significance of using 1,000 vs. 1,024 in data storage calculations?

  • 1,000 bytes = 1 kilobyte
  • 1,024 bytes = 1 kibibyte
  • Use 1,000 for simpler calculations in exams
• What is the importance of calculating storage capacity requirements?

  • Ensures sufficient space for data
  • Helps in planning data storage needs
  • Aids in efficient data management