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SSD or HDD - what is the difference?

SSD or HDD - what is the difference?


Modern computers use two types of drives:

How SSDs work

SSD is faster and more modern, but so far "hard drives" also remain relevant for a number of reasons. In this article we will consider the principles of both types of drives, their advantages and disadvantages. We will also tell you what to look for when buying.

SSDs are non-mechanical storage devices that are many times faster than traditional HDDs. They use high-speed flash memory to store information, and the controller provides access to this data. The data is contained in NAND memory, which consists of links of floating-gate transistors. This design allows you to maintain a charged state when disconnecting the drive from the network. As a result, all data is stored on the computer when it is turned off.

How HDDs work

Hard disks also belong to the class of storage devices, but have a radically different principle of operation, reminiscent of old tape recorders. There is a working surface of a disk and a head for reading combined with the basic design by a rotating shaft. Magnetized heads move on plates, writing and reading information. This is a strong simplification, but enough to form a general picture of the principles of HDD. As we can see, the differences between HDD and SSD are significant. The principle of operation of the former is based on mechanical phenomena, and the latter belong to the category of non-mechanical memory. They simply have no moving parts.

Here we come to the first important point - the types of memory. While browsing online store directories for the right SSD, you could see devices with four types of memory:

To summarize, everything is simple. For expensive PCs and laptops, choose MLC. Expensive, fast, long lasting. In professional activities and games will not disappoint. TLC is the same, but a little cheaper and worse in terms of durability. A good option for a mid-range PC. If you do not record large amounts of data regularly, you will not notice much difference. QLC is better not to take at all, frankly. Except for a small upgrade of an old laptop or PC - in this case, it just does not make sense to buy something expensive and better.


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