What are the differences between HDD , SSD and SSHD ?

When it comes to performance, nothing beats a laptop storage drive upgrade. But, choosing a drive isn't as simple as it once was. Today, but what's the difference?

Here's a comparison guide of all three types. 

First: SSDs Drives

SSDs are considered the most durable drive type. Because these drives are solid state, they do not have any moving parts. The absence of moving parts means that you can drop, shake, and put SSDs to temperature tests without damaging the drive (within reasonable limits). SSD designs are also the thinnest and lightest, making these drives great for lighter PCs. When it comes to multitasking, SSDs are also the best performing drives available, though they are not cheap. High capacity SSD options are often out of reach monetarily, which is why lower capacity drives are often chosen. 

Second: HDD DrivesWithout argument, HDD drives can store more data and outperform SSD or SSHD drives. Typically, HDD drives are available in7mm and9.5mm formats, which makes them bigger than a SDD drive. HDDs do provide good performance marks for most PCs on the market, though they do have moving parts, and this makes the HDD option less durable than a SSD choice. 

Third: SSHD Drives If you combined a SSD with a HDD drive, the outcome would be a SSHD drive. Literally, 'SSHD' stands for 'Solid State Hybrid Drive,' and that's just what it happens to be. This hybrid drive combines both moveable and immovable parts, so it's sturdier than a HDD drive and slightly less sturdy than a SSD drive - but much more affordable. SSHD drives will ramp up your system's performance (depending on which one you choose), and you will notice a difference where things like restart, sleep, and overall speed go. Next to SSD drives, SSHD drives are the most power-efficient option, so this is also something to keep in mind. 

Overall Conclusions

When it comes to failure rates, all three drive types easily compare. Lately, many people prefer the SSHD option, though, because it does combine the best of both worlds (uses both HDD and SSD features, separately). In most cases, the thing to think about when choosing a drive type is cost-effectiveness. You want to get as much "bang for your buck" as you can when buying a drive because drives aren't cheap. In this reviewer's opinion, the SSHD option is the best choice, since it is the most cost-effective option; combines both HDD and SSD options; and is slim enough to fit into your shirt pocket. Right now, Seagate and Toshiba both offer SSHD options that are affordable and perform well. When choosing between the two, Seagate's SSHD choices are more affordable, though they offer performance levels that are nearly the same as what Toshiba has come up with. There are other options on the market, though these two companies provide the best SSHD choices at the time of this writing.

HDD:Hard Disk Drives is abbreviated as HDD and is the component of the computer that can store data while the machine is powered down. The HDD is the main, and mostly is the major storage hardware in any type of computer. HDD stores the OS, all programs, and data files and it operates by running needles across a spinning disk. Today HDDs are the most common means of high capacity computer storage, with almost all types of PCs and Laptops. SSD:SSD is the abbreviation of Solid State Drive. SSD stores computer data on non-volatile "flash" memory chips rather than by changing the surface properties of a magnetic or optical spinning disk. SSD has no moving parts, which gives it advantages over HDD in accessing stored information faster on our PC/Laptop. SSHD:SSHD is basically the combination of SSD & HDD. It stands for Solid State Hybrid Drive. It has some features from HDDs and some from SSDs. Solid State Hybrid Drive combine a small, fast and affordable amount of NAND flash memory with a traditional hard drive. At this stage we are able to have a little bit idea about the SSDs, HDDs and SSHD. Now the question is which storage device should we choose among them? To answer this question we will take a look what are the advantages of using these storage devices after that will solely depends on your mindset and your requirement that what you want performance, storage capacity or both. I am keeping below points to understand the difference between SSDs and HDDs. We will discuss SSHD later in this article.

Go with Ms. Ghada Eweda's answer. That is what I wanted to say.. Thanks for your invitation

HDD:Hard Disk Drives is abbreviated as HDD and is the component of the computer that can store data while the machine is powered down. The HDD is the main, and mostly is the major storage hardware in any type of computer. HDD stores the OS, all programs, and data files and it operates by running needles across a spinning disk. Today HDDs are the most common means of high capacity computer storage, with almost all types of PCs and Laptops. 

SSD:SSD is the abbreviation of Solid State Drive. SSD stores computer data on non-volatile "flash" memory chips rather than by changing the surface properties of a magnetic or optical spinning disk. SSD has no moving parts, which gives it advantages over HDD in accessing stored information faster on our PC/Laptop. 

SSHD:SSHD is basically the combination of SSD & HDD. It stands for Solid State Hybrid Drive. It has some features from HDDs and some from SSDs. Solid State Hybrid Drive combine a small, fast and affordable amount of NAND flash memory with a traditional hard drive.

HDD DrivesWithout argument, HDD drives can store more data and outperform SSD or SSHD drives. Typically, HDD drives are available in 7mm and 9.5mm formats, which makes them bigger than a SDD drive. HDDs do provide good performance marks for most PCs on the market, though they do have moving parts, and this makes the HDD option less durable than a SSD choice. SSHD DrivesIf you combined a SSD with a HDD drive, the outcome would be a SSHD drive. Literally, 'SSHD' stands for 'Solid State Hybrid Drive,' and that's just what it happens to be. This hybrid drive combines both moveable and immovable parts, so it's sturdier than a HDD drive and slightly less sturdy than a SSD drive - but much more affordable. SSHD drives will ramp up your system's performance (depending on which one you choose), and you will notice a difference where things like restart, sleep, and overall speed go. Next to SSD drives, SSHD drives are the most power-efficient option, so this is also something to keep in mind. 

The wight , power , transfer speed , temperture

SSHD combind both SSD and HDD specs 

I agree with Ghada Eweda ans.

1. -SSD- (solid sate drive..use NAND-based flash memory), 
2. -Hard Disk Drives, or HDD in techno-parlance, have been around for donkey's years relative to the technology world. HDDs were first introduced by IBM in 1956 - yes folks this is nearly 60-year old technology
3. SSHD  hybrid drive is a logical or physical storage device that generally combines a fast storage medium such as NAND flash with a slower alternative such as a HardDisk Drive 

Agree with expert ansewrs above

HDD DrivesWithout argument, HDD drives can store more data and outperform SSD or SSHD drives. Typically, HDD drives are available in 7mm and 9.5mm formats

SSHD DrivesIf you combined a SSD with a HDD drive, the outcome would be a SSHD drive. Literally, 'SSHD' stands for 'Solid State Hybrid Drive,' and that's just what it happens to be

SSHD drives will ramp up your system's performance (depending on which one you choose), and you will notice a difference where things like restart, sleep, and overall speed go.