2.1 + 2.2 - Primary / Secondary + solid state storage

• Primary storage is also known as

  Main memory
• Primary storage holds:

  Data, programs, and instructions

  That ARE currently in use
• Primary storage is?

  Volatile
• What does volatile mean?

  It loses it‘s data if not saved
• Primary storage includes:

  • ROM
  • RAM
  • Flash memory
  • Cache memory
• Secondary storage is…

  Non-volatile. It stores data permanently - including when the device is turned off
• Secondary storage

  Stores MUCH larger amounts of data
• Secondary storage includes:

  • Hard Disk Drives
  • Solid State Drives
  • USB flash drives
  • CDs + DVDs
• Solid state storage:

  Does not have any moving parts. Eg : USB flash drive
• Solid state storage devices:

  • Solid State Drives
  • USB flash drives
  • Memory Cards (used in phones and cameras)
• Solid state devices are:

  • low power
  • high speed
  • durable
  • portable
  • high storage capacity
  • reliable
• What are the 3 types of secondary storage?

  • optical
  • magnetic
  • solid state