Memory & Memory Types : RAM vs ROM


  • Computer need’s a space to for launching a program or holding a data, that kind of space is known as computer memory.
  • Memory can be temporary or permanent.

Two types are:

  • RAM (Random Access Memory) 
  • ROM (Read Only Memory)

RAM (Random Access Memory)

  • Also known as Primary memory.
  • Is a volatile memory.
  • It’s a Temporary storage device.
  • Data will read randomly.
  • Access time is same for any address.
  • All the data or instructions were deleted when the power is switched off.
  • Hold instructions or data.
  • Enhance the performance of computer.
  • Two types are
  • Static  RAM (SRAM)
  • Dynamic RAM (DRAM)

Dynamic RAM (DRAM):

  • Small in size.
  • Less cost than SRAM.
  • Constantly refreshed and recharged by CPU (Processor).
  • Normally used in Personal Computers.
  • Two types are

SIMM (SingleInlineMemoryModule) DIMM (DoubleInlineMemoryModule)

Static RAM (SRAM):

  • Costly than DRAM.
  • Faster than DRAM.
  • Physically larger than DRAM.

ROM (Read Only Memory)

  • It is a permanent memory.
  • Data can read only.
  • It is a non – volatile memory.
  • Holds data or instruction’s permanently.
  • Data first-time recorded by the manufacturer.
  • User can’t change it directly.
  • All the data or instructions were not deleted when the power is switched off.
  • Three types are
  • PROM (Programmable Read Only Memory)
  • EPROM (Erasable Programmable Read Only Memory)

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