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Computer Memory Notes for IBPS Bank Exam

Computer Memory Notes for IBPS Bank Exam - A memory of computer is just like a human brain.It is used to store data and instructions. Computer memory is the storage space where data is to be processed and instructions after processed are stored. The memory is divided into large number of small parts called cells .each cell has a unique address which varies 0 to memory size minus one.

Types of Computer’s Memory

Memory is three types

  1. Primary Memory
  2. Secondary memory
  3. Cache memory

Primary Memory (Main memory)

ram romPrimary memory holds only those data and instructions on which computer is currently working. It has limited capacity and data is lost when power is switched off. It is generally made up of semiconductor device. These memories are not as fast as registers. The data and instruction required to be processed reside in main memory. It is divided into two subcategories RAM and ROM.

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Characteristics of Main Memory

  • These are semiconductor memories
  • It is known as main memory.
  • Usually volatile memory.
  • Data is lost in case power is switched off.
  • It is working memory of the computer.
  • Faster than secondary memories.
  • A computer cannot run without primary memory.

Characteristic of Secondary Memory

  • These are magnetic and optical memories
  • It is known as backup memory.
  • It is non-volatile memory.
  • Data is permanently stored even if power is switched off.
  • It is used for storage of data in a computer.
  • Computer may run without secondary memory.
  • Slower than primary memories.

Cache memory


Cache memory is a very high speed semiconductor memory which can speed up CPU. It acts as a buffer between the CPU and main memory. It is used to hold those parts of data and program which are most frequently used by CPU. The parts of data and programs are transferred from disk to cache memory by operating system, from where CPU can access them.

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