Difference Between SSD and HDD

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In this post, we will understand the difference between SSD and HDD.


  • It stands for Hard Disk Drive.

  • It contains moving mechanical parts such as the arm.

  • It has longer R/W time.

  • It has high latency.

  • It supports less number of I/O operations per second.

  • It uses fragmentation.

  • It is heavy in weight.

  • It is larger in size.

  • The data transfer in HDD is sequential in nature.

  • It is less reliable since there could be a mechanical failure in it, such as the head crash and susceptibility to strong magnets.

  • It is cheaper with respect to per unit storage.

  • It is an older technology.

  • It is a traditional technology.

  • It produces noise due to mechanical movements.


  • It stands for ‘Solid State Drive’.

  • It doesn’t contain mechanical parts, only electronical parts like ICs.

  • It has a shorter R/W time.

  • It has low latency.

  • It supports more number of I/O operations per second.

  • It doesn’t have fragmentation.

  • It is lighter in weight.

  • It is compact in size in comparison to HDD.

  • The data transfer is done in a random manner.

  • It is reliable.

  • It is expensive with respect to per unit storage.

  • It is a relatively new technology.

  • It doesn’t produce any noise.

Updated on 15-Apr-2021 07:52:56