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Difference between Hard Disk Drive (HDD) and Solid State Drive (SSD)
  • Last Updated : 21 Aug, 2019

Many users are in a quandary over the choice of either HDD or SDD. There is not a universal answer, as there are merits and demerits to both of them. The choice is heavily dependent on the user, their needs and budget.

Similarities between HDD and SDD:

  • Both are used to store data.
  • Both are used to boot the system.
  • Both are I/O devices.

Differences between HDD and SDD :

Parameter HDD SSD
Full Form HDD stands for Hard Disk Drive. SSD stands for Solid State Drive.
Components HDD contains moving mechanical parts, like the arm. SSD does not contains, mechanical parts, only electronical parts like ICs.
R/W Time HDD has longer R/W time. SSD has shorter R/W time..
Latency HDD has higher latency. SSD has lower latency.
I/O operations per second HDD supports fewer I/O operations per second. SSD supports more I/O operations per second.
Fragmentation HDD has fragmentation. SSD do not has fragmentation.
Weight HDD is heavier in weight. SSD is lighter in weight.
Size HDD is larger in size. SSD is more compact in size.
Data Transfer In HDD the data transfer is sequential. In SSD the data transfer is random access.
Reliability HDD is less reliable due to possibility of mechanical failure, like head crash and susceptibility to strong magnets. SSD is more reliable.
Cost HDD is cheaper per unit storage. SSD is costlier per unit storage.
Time of Release HDD is older and more traditional. SSD is newer to use.
Noise HDD can produce noise due to mechanical movements. SSD does not produces noise.

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