Hard disk - how to choose so as not to regret it?

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In the pioneering days of computer science, the hard drive was not the basic equipment of a computer at all. Data was recorded either on special perforated tapes or on external media. Currently, hard drives, made in various technologies, host the vast majority of electronic gadgets. Let's take a look at their most popular models.

HDD - magnetic hard disk

The basic parameters of a magnetic hard disk that you need to pay attention to are the rotational speed and the amount of cache memory. The first is the speed at which the device reads the data. To work comfortably, the absolute minimum is 7,200 rpm. More expensive models offer up to 10,000 revolutions - therefore they are used in servers and professional workstations. The cache, in turn, is the hard disk cache necessary for its smooth functioning. Here, the minimum is 32 megabytes, and the optimal choice is double the capacity. To choose a hard drive, you should also take into account the data transmission interface, i.e. the way the device is connected to the motherboard. The best and fastest solution is SATA III.

Information capacity units

1 byte = 8 bits

1 kilobyte (kB) = 1024 bytes

1 megabyte (MB) = 1024 kilobytes

1 gigabyte (GB) = 1024 megabytes

1 terabyte (TB) = 1024 gigabytes

HDD manufacturers report data recording and reading performance expressed in megabytes per second (MB / s). Speeds above 100 MB / s are quite a decent result, some models even reach the value twice as high. However, this is nothing compared to the possibilities of hard drives made in SSD technology.

SSD - fast and secure hard drive

SSD stands for Solid State Drive. Hard drives of this type do not have mechanical elements (such as platters in traditional HDDs), thanks to which they are very resistant to shocks and damage. They are perfect for laptops, netbooks and tablets. This technology is similar to the one in which flash drives (flash drives) are made. SSD disks are definitely faster than their magnetic counterparts - they reach speeds of up to 600 MB / s. A computer equipped with such a device is quieter and more efficient. The operating system installed on the SSD hard drive starts in a few seconds.


When purchasing a hard drive, pay attention to its size. Standard HDD models, designed for desktop computers, have a size of 3.5 inches, so they will not fit into a laptop case. For portable devices, 2.5 inch mechanical drives and SSDs are suitable.

The disadvantage of SSDs is their price. Good models with a capacity of only 120-128 gigabytes cost between 300 and 400 zlotys. If the computer user stores movies, music, and many pre-installed programs on the hard drive, this capacity is not enough. For this reason, many people decide to compromise - using a fast SSD for the operating system and the most important software, and a large HDD for the data store. The alternative is to purchase an SSHD device, which is a hybrid hard drive. The standard magnetic model is equipped with an SSD partition. A special controller decides which data is saved in this area - usually these are the ones we use most often.

RAID - hard drive several times

Every hard drive can break down at some point, so it is worth investing in backup systems. If you are looking for an efficient solution that will give you maximum security, consider RAID. It is a technology based on the cooperation of two (or more) hard drives connected into one matrix by means of a special controller. There are different types of connections of this type - for data security, RAID 1, the so-called mirror model. In it, both memories store the same information in parallel, so losing one of them will not do any harm. You must remember that the disks that make up the matrix have the same capacity and rotational speed.

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