HDD stands for Hard disk drive which uses platters or disk to store data and can read or write data from continuously rotating platters by using read/write head. It consists of a stack of platters that automatically start spinning as soon as computer system switched on, enabling it to store and retrieve a large amount of data from these electromagnetically charged surfaces. These platters are further divided into sectors, tracks, and cylinders.
Cylinder—> Set of Tracks —> Segments of Sectors
Head or an arm located at a fixed point on both sides of platter frequently sense the tracks of the spinning platters as and when it required to read or write data.
Solid state drive, a competitive storage media for HDD which uses a non-volatile storage media technology named NAND flash memory ( A technology that is being used in USB flash drives, SD Cards, and digital camera) . A SSD comprises of a flash controller which responsible for controlling operations related to read or write data and NAND flash memory chip. These are made with FGRs ( floating gate transistors), allowing it to keep retain data which makes it non-volatile. In this, the number of write cycle are limited as the cells where data get stored may wear out due to write operation.
|Solid State Drive (SDD)||Hard Disk Drive (RDD)|
|In this, no rotating part is present, instead, semiconductor chips are used namely flash chips to store data.||In this type of Storage Device, Data are stored on a rotating platter magnetically.|
|It uses a non-volatile technology named NAND flash memory which makes it faster and preserves your data for a longer time||It is slower than SDD when it comes to read or write data as the transfer rate depends upon the speed of the rotating platter|
|SDD is more expensive as compared to HDD||It is cheaper than SDD|
|No noise is produced as it doesn't have any moving part for storing data||As and when the computer boots up, the platter starts moving as a result noise and vibration are produced|
|When it comes to capacity SDD falls behind of HDD||In terms of Capacity, HDD ranges from 500 GB as the base hard drive capacity. It can hold more data as compare to SDD.|