Computer Memory and storage

Computer Memory and storage


The storage unit of a computer system holds (or stores) the following :

  • Data and instructions required for processing (received from input devices)
  • Intermediate results of processing
  • Final results of processing, before they are released to an output device

Types of Memory

  • Primary Memory
  • Secondary Memory

Primary storage

  • Used to hold running program instructions
  • Used to hold data, intermediate results, and results of ongoing processing of job(s)
  • Fast in operation
  • Small Capacity
  • Expensive
  • Volatile (looses data on power dissipation)

Secondary storage

  • Used to hold stored program instructions
  • Used to hold data and information of stored jobs
  • Slower than primary storage
  • Large Capacity
  • Lot cheaper that primary storage
  • Retains data even without power
Classification of Commonly Used Secondary Storage Devices