HDD vs SSD - Difference and comparison

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If you are in the market to buy an external hard drive,you are hearing terms "SSD" and "HDD".so many people confusing to buy SSD or HDD.
External hard drives are used to backup your important files,some files that are really large or to backup data that is so big it cannot be stored on your computer (or) laptop.so one would use a Hard Disk Drive for this purpose.
             The most recent solid state drive serves a similar purpose,but this is completely different enabling many performance improvements over HDD.A SSD can speed up the performance of a computer significantly,often more than what a faster processor (or) RAM.SSD are the latest technology when it comes to data storage and work on the frame work of inter connected flash memory chips.HDDs work on older technology that uses moving disks and readers to store and retrieve data SSDs have several advantages over HDD drives.
Here are few comparisons between SSDs and HDDs,that will help you to decide between the two based on your needs and how you plan to use your external drive.
Speed:
HDD has higher latency,longer read/write times and support's fewer IOPs compared to SSD.
SSD has lower latency,faster read/write and support's more IOPs compared to HDD. Because SSD are based on a flash memory design,they are able to start,copy,paste and delete data a lot quicker than a HDD. So if you are looking to work with large files that you need transferred or read quickly than a SSD is the way to go. This is the right option especially useful when watching video or audio content on your computer or other from the external drive.
Electricity, Noise and Heating
Hard Disk drive use more electricity to rotate the platters that generates heat and noise.
Solid state drives are the noiseless and do not get heated up and noise when used since they have moving parts and it use less power.
Size and Weight
SSDs are much smaller in size and weight compared to HDDs. Because SSDs don't have the rotating disks,spindle and motor. 
Power
SSDs comsumes less power than HDDs as they don't have any moving parts.This is especially useful if you are using along with a laptop where it will reduce the battery capacity.
Components
HDD contain more components-- motor,driver spindle that holds one(or)more flat circular disks coated with a thin layer of magnetic material. Read and write heads are possitioned on the top of the disks.
SSD contain less components-- it is essentially a memory chip.It is interconnected, integrated circuits with an interface connector. There are three basic components- controller,cache and capacitor.
Dealing with vibration
In HDD moving parts make them susceptible to crashes and damage due to vibration.
SSD drives can withstand vibration upto 2000Hz,which is much more than HDD.


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