How to choose hard disk SSD and HDD: hard disk comparison
By Margarita Fleiszig 2020-01-03 1789 1
What is SSD?
Typical SSD is a flash memory based on NAND technology, which is a kind of non-volatile memory. What does non-volatility mean? The answer is that if you stop running the hard drive, its stored contents will not be lost. This is, of course, the basic feature of any type of permanent memory. In the early days of SSD drives, there were doubts that the data stored in SSD drives would fail in a few years. Today's technology breaks this myth, because people can read and write data to and from SSD drives frequently for a long time, and their data storage integrity will remain for more than 200 years. In other words, SSD can store data for longer than humans! instead of a robotic arm that reads and writes HDD hard disk data,
SSD hard drives use embedded processors (or "brains") called controllers to perform a series of operations related to reading and writing data. Its controller is a very important reason for determining the access speed of SSD. Its decisions about how to store, retrieve, cache and clean up data can determine the overall speed of the drive. The various tasks it performs, such as error correction, read and write caching, encryption and spam collection, are not described here. But good controller technology can usually get better SSD. An example of a fast controller is the SandForce SATA3.0 (6GB/s) SSD controller, which supports burst speeds up to 550MB/s read and write speeds. The SandForce3700 series controller was launched at the end of 2013 and has the performance of 1800MB/s read / write sequential speed and 150k/80k random IOPS. The form factor of the
SSD is actually the same as that of a conventional hard drive. It comes in standard 1.8in, 2.5in or 3.5in sizes and can be installed and connected like a HDD hard drive of the same size. Connectors for these standard sizes use the SATA interface. In addition, there are smaller SSD, that use the so-called mini-SATA (mSATA) standard and can be plugged into the mini-PCIExpress slot of a laptop.
What is HDD?
Compared to the technology world, HDD hard drives have been around for a long time. HDD hard drives were first introduced by IBM in 1956, a technology that was developed nearly 60 years ago. HDD hard drives use magnetic materials to store data on rotating disks. The read / write head is suspended above the rotating disc to read and write data. The faster the disk rotates, the faster the HDD hard drive performs read and write operations. A typical laptop HDD hard drive can now rotate at 5400RPM (revolutions per minute) or 7200RPM, while some servers' HDD drives can rotate at speeds up to 15000RPM. The main advantage of
HDD hard disk is that it can store a large amount of data cheaply. Today, 1TB storage is common for laptops, and its capacity continues to grow. Although the cost per TB byte is difficult to calculate, it is safe to say that the price of all HDD hard drives is much lower than that of SSD hard drives. Therefore, if you want to get lower prices, larger capacity of storage devices, the use of standard HDD hard drives is undoubtedly a better choice.
In terms of appearance, the HDD hard drive itself looks like the SSD hard drive. HDD hard disk mainly uses SATA interface. The most common size of a laptop hard drive is 2.5 inches, while desktops use the larger 3.5 inches. On the other hand, more disks can be deployed in larger HDD hard drives, thus providing higher storage capacity. Some computer hard drives can store data as high as 6TB. Comparison of
SSD and HDD
Now make some comparisons between SSD and HDD and determine which hard drive best suits the user's personal needs. The way to compare the project is to use a table for comparison, where the green check box indicates the leading option for project comparison:
If you sum up this check mark, it is found that there are 9 items leading the SSD hard drive and 3 items leading the HDD hard drive. Does this mean that the performance of the SSD hard drive is three times better than that of the HDD hard drive? This is not the case, as mentioned above, it all depends on the needs of the individual. The comparison here is only to list the pros and cons of these two options. Here are some rules when deciding which drive is most appropriate:
HDD hard drives may be the right choice:
Requires a large amount of storage capacity, up to a maximum of 10TB. Do not want to spend too much money, do not care too much about the speed at which the computer starts or opens the program, so you can choose to use the HDD hard drive.
SSD hard drive may be the right choice:
Willing to pay more for performance. Do not mind the limited storage capacity or can be done (although the SSD hard disk capacity is now up to 4TB, enterprise SSD hard drives up to 60TB)
Today, the HDD hard drive is still the choice of most ordinary consumers, usually choose the HDD hard drive as the storage option in the new computer, and the cost is lower. However, more and more consumers want the highest computing performance and are choosing SSD hard drives in their new settings. As a result, SSD hard drives are becoming the mainstream of standard storage devices, especially for laptops, because SSD hard drives have many advantages over mobile devices (they are now the default storage devices in the Ultrabook category).
In short, HDD hard drives and SSD hard drives have their own markets. MSATASSD devices and hybrid drives, which have the performance and characteristics of both SSD hard drives and HDD hard drives, are a better choice for consumers to seek the best of both worlds.
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