RAM and ROM | Dynamic and Static RAM

Differentiate RAM and ROM. Explain the Dynamic and Static RAM with their merits and demerits.

Answer: RAM and ROM

RAM (Random access memory)

  • RAM means Random access memory. It is also called as volatile memory.
  • Random access memory or RAM is a form of data storage medium that can be accessed randomly at
    any time.
  • The information stored in the RAM is easily accessed by the processor.
  • Both the read and write operations can be performed in RAM.
  • RAM memory is only used to store the temporary information.
  • The accessing speed of RAM is faster.
  • The price of RAMs are comparatively high.
  • RAM is available in the form of chip.
  • Physically size of RAM chip is larger than ROM chip.
  • The RAM is categorized into two types :

(i) Statistic RAM (SRAM). (ii) Dynamic RAM (DRAM).

ROM (Read only memory)

  • ROM Means Read only memory. It is also called as non‐volatile memory.
  • Read‐only memory or ROM is a form of data storage medium that permanently stores data on personal computers and other electronic devices.
  • The processor cannot directly access the information that is stored in the ROM.
  • The ROM memory only allows the user to read the information.
  • User cannot make any changes to the information.
  • ROM memory is used to store permanent information.
  • The accessing speed of ROM is slower as compared to RAM.
  • The price of ROMs are comparatively low.
  • ROM is available in the form of optical drivers that are made of magnetic tapes.
  • Physically size of ROM chip is smaller than RAM chip.
  • The ROM is categorized into three types :
    PROM (Programmable read only memory).
    EPROM (Erasable programmable read only memory).
    EEPROM (Electrically erasable programmable read only memory)


Advantage of static RAM :

1. Static RAMs are faster.

2. Static RAMs are less complex.

3. Static RAMs do not require refreshing operation at regular interval.

4. Static RAMs are directly used in cache memory.

Disadvantages of SRAM :

1. Static RAMs are expensive.

2. Static RAMs requires more space.

3. Static RAMs consumes more power.

Advantages of DRAM :

1. Dynamic RAMs are simple.

2. Dynamic RAMs require less space.

3. Dynamic RAMs consumes less power.

4. Dynamic RAMs are cheaper.

Disadvantages of DRAM :

1. Dynamic RAMs are slower than static RAMs in speed.

2. Dynamic RAMs also require refreshing operation after regular intervals.

3. Dynamic RAMs cannot be used where only small amount of memory is needed.

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