What Is the Difference Between SDD and HDD

First of all what is an SSD (Solid State Drive)?
Solid state is an electrical term that refers to electronic circuitry that is built entirely out of semiconductors.

The term was originally used to define those electronics such as a transistor radio that used semiconductors rather than vacuum tubes in its construction. Most all electronics that we have today are built around semiconductors and chips. In terms of a SSD, it refers to the fact that the primary storage medium is through semiconductors rather than a magnetic media such as a hard drive.
Well this seems boring for Most of you who don?t want to hear these technical terms, such a bore some times.

This technology has actually been around for many years, but now it is set to become something that consumers may actually use.
Well, an SSD on the outside looks almost no different than a traditional hard drive. This design is to allow the SSD drive to put in a notebook/Laptop or desktop computer in place of a hard drive. It uses a standard dimension as a 1.8, 2.5 or 3.5-inch hard drive. It also uses either the ATA or SATA drive interfaces so that there is a compatible interface.
Now here we go, enough for the history.

• HDD hard drives store data on rapidly rotating platters in your device, because of the construction HDD drives are prone to shocks or vibrations. HDDs are the ones most of us have in laptops desktops and carry around calling external hard drives or USB hard drives. Man these things can consume power. And in some old computers they make noise like a grinding machine.

• SSD hard drives are like a big memory card (like in your cellphone) so there are no moving parts to make noise making the device better to use in areas of high vibration like in a car.

Here's the difference between SSD and HDD when it comes to general things.

Advantages

Performance: SSD boots up, reads data, and shuts down 25-75 % faster than HDD.

Weight: SSD is lighter

Rigidity: In vibration areas and tests, HDDs crash, whereas the SSD keep going on as if there is nothing happening.

Disadvantages:

Price: These things are Expensive can you imagine 256GB of an SSD is US$580 vs. US$50 for a similar size external USB HDD . I do not think you want to go for one now as yet. But they will come down as time goes and more manufactures come in so lets be patient.

Durability: A lot more vulnerable to static shocks

Power: Tends to eat more power at idle or even underwork loads

Life: Has a lower write cycle. An HDD will wear down after 1,000,000+ read/write cycles, where as an SSD has a life of 10,000-100,000 write cycles.
If you want a really fast read/write speed, then go with the SSD, unless you are concerned with the life of it. If you're okay with using it just for 1-2 years, then go for it.

Personally, I'd stick to a 5400 RPM HDD, especially if I have an ultraportable. The higher speeds result in battery consumption, and as a result, your ultraportable won't be too independent from the power cable with a 7200 RPM HDD.