Difference between RAM and HDD

Computer EngineeringComputer NetworkMCAComputers

RAM and HDD, are both types of computer memory. RAM is used to store computer programs and data that CPU needs in real time. RAM data is volatile and is erased once computer is switched off. HDD, hard disk has permanent storage and it is used to store user specific data and operating system files. HDD data is static and remains in the computer even if computer is switched off.

Following are the important differences between RAM and HDD.

1DefinitionRAM stands for Random Access Memory.HDD stands for Hard Disk Drive.
2MemoryRAM is also called Primary Memory or Main Memory.HDD is also called Secondary Memory.
3ComponentRAM has no moving mechanical parts and consists of transistors etc.HDD contains moving mechanical parts like arm, pin etc.
4R/W TimeRAM has small read/write or R/W time.HDD has higher read/write time.
5AccessEvery memory area of RAM is accessible at same speed.Different area of HDD may take different time to access.
6CPU AccessCPU can access data stored on RAM.Data to be copied from ROM to RAM so that CPU can access its data.
7CapacityRAM memory is generally smaller than HDD. Now-a-days it ranges fron 1GB to 8 GB in desktops.HDD memory is very high. It ranges from 500GB to 4TB in desktops.
8NoiseRAM don't produces any noise.HDD produces noise due to mechanical movements.
9CostRAM is costly per unit storage.HDD is cheap per unit storage.
10Impact on SpeedIf RAM is low, computer will become slow.HDD has not much inpact on computer's speed.
Updated on 26-Nov-2019 12:17:05