What is SSD?

Low probability of failure, endurance and high performance are the main reasons why people today choose SSDs rather than traditional hard drives.

When you build a new computer or upgrade the old have to consider a lot of things. The main issue of concern to users – how to make the computer "fly". This is possible if the PC would stand a good CPU, discrete graphics card and enough RAM. A lot depends on the type of internal memory. In one article about all the nuances to tell, so we dedicated it to one theme – solid state drives. Today we will explain how SSD drives, what types are they and what are their advantages over HDD.

What is SSD?

In the computer and laptop permanent memory is presented in the form of HDD or SSD drive. In the HDD the information is stored on rotating platters and movable read head. Solid state drives SSD are arranged on a different principle. Unlike HDDs, they have no moving elements. Data is written to the chip flash memory, are similar to those used in smartphones, tablets and USB-stick. SSD is characterized by high speed of all the memory available immediately, no need to wait for the disk to spin and the read head will find a region with the desired file.

Solid state drives are available in different sizes and with different amount of memory from 32 GB to 10 TB. Their production is more expensive than the production of HDD, although every year the price goes down: if five years ago, SSD 64 GB cost 3-4 thousand rubles, but now for the same amount you can buy the drive at 0.5 TB.

The benefits of SSD

There are not only internal but also external solid state lasers.

Solid state drives are found in all kinds of computers, from powerful gaming stations to netbooks, entry-level, and for good reason. Over the classic HDD and built-in eMMC SSD drives have some important advantages.

The lack of moving mechanics. Any movable element is potentially vulnerable. If one of the HDD moving parts will fail with high probability will have to say goodbye to the whole disk. Hard drives require careful operation, they absolutely can not drop. Here lies the reason for their rapid wear.

The SSD is also not eternal. Their resources are limited, but in General they are more durable and reliable than the HDD. They have no spinning platters or moving heads, and falling on the floor they are not so terrible.

The speed. Processes read/write on the SSD are much faster than hard drives and eMMC, which is very important when working with large volumes of data. Time random access (i.e., access to the opposite sectors of the disk) is several microseconds, which is why the system installed on the SSD loads so fast.

Mobility. SSDs are smaller and lighter than the winchesters. They can be put in ultra-thin laptops and tablets. The thin solid state drives have a width of only a few millimeters. This size is ideal for use in small devices with high performance.

Low failure rate. At improving the SSD manufacturers have spent more than a year. Today SSDs fail under much less than hard disks, and the speed of operation is maintained during the whole service life. Low probability of failures due to the presence of software features such as automatic error correction ECC.

Size and design. SSDs come in various form factors: SSDS can fit in the slot for the graphics card, compartment for 2.5” HDD or memory 2. It all depends on the number of memory chips and their location. For any computer to find any form of SSD.

Long service life. The limit of the HDD is 5-10 years. And on the health of the hard drive affects not only exploitation, but also factors such as temperature and humidity.

The life of the SSD, measured in terabytes of information that can be recorded to it before the cells of the flash memory will lose the ability to retain electrical charge. It may take decades: the drive is rather outdated morally, than fails.

The types of SSD

SSDS differ in the interfaces. Each is characterized by its speed, capacity and thermal performance.

SATA III. The latest iteration of a long-existing connection interface provides maximum compatibility. The availability of SATA III is especially useful when migrating from HDD to SSD because the HDD-compatible motherboard is able to work with solid state lasers. This is the most common type of connection, but the slower is its speed a maximum of 550 MB/s For connecting the disk with the motherboard requires SATA cables, which is often bad for cable management inside the computer.

PCIe. Expansion slot PCI Express is typically used for graphics cards, sound cards etc. Through it you can connect to PC and compatible SSD. Its obvious advantage over SATA higher throughput, on average about 780 MB/s, but in more expensive solutions it may be higher.

Drives PCIe 4.0 is the latest generation (support first appeared in motherboards AMD X570) provides sequential read speeds up to 5000 MB/s and write to 4400 MB/s. I Must admit that the increased throughput does not always lead to a significant increase in the performance of your computer. Besides the price tag of these discs is two times higher than the SATA counterparts.

M. 2. The smallest SSD are equipped with connection type 2 M, they can use controllers SATA or NVMe (it is necessary to clarify before purchase), so the speed vary greatly. They have a short connector and firmly attached to the motherboard, which allows economical use of space inside the case. However, due to the compactness of M. 2 SSD easily warm up, especially for drives with high speed. For this reason, they are often equipped with cooling elements, such as RAM.

NVMe. The nonvolatile Express-memory – standard individual SSDs. This is the fastest way of interaction of the disk with the host system. In conjunction with the PCIe and M. 2 NVMe interface provides maximum bandwidth.