Best scientific research 2022

BEST SCIENTIFIC
RESEARCH - 2022 
167 
operating system is loaded from the hard disk, or as computer scientists call it, a "screw". If 
the drive fails, you have to spend a lot of money to buy a new hard drive. But the most 
important thing is that if a backup is not created beforehand, all data will be lost. 
Hard drives are: 
- external - external HDD; 
- internal - internal HDD. 
Features of the selection internal hdd. 
There is an internal hdd in the body of the system unit, what is it and what to pay 
attention to when buying. Hard drives are designed to store data and load the operating 
system. Hard drives that ensure the reliable and efficient operation of the operating system 
increase the requirements. The requirements for an internal HDD, whose main function is 
to store and process data, are completely different. 
The problem of choice is solved by the possibility of installing several hard drives in 
modern personal computers, each of which performs its own tasks. 
It is issued for internal hdd for personal computer and laptop. They differ in size: 
- 3.55 inches for PC; 
- 2.5 inches - for a laptop. 
Hard disk settings. 
The need to buy a new device arises in two cases: the capacity of the working hard 
disk is not enough for the normal operation of the computer, or the old disk has failed. 
Winchester is one of the most unreliable computer components because it combines 
complex mechanical parts and circuit boards. In addition, mechanics cannot withstand 
physical effects: vibrations, vibrations, shocks. How to determine if the hard drive is out of 

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BEST SCIENTIFIC
RESEARCH - 2022 
168 
order? If there are problems with the device, the computer can restart, freeze or turn off at 
any time. 
What is better to do: buy a new hard drive or repair the old one? The answer is 
obvious: it is easier and cheaper to buy a new internal hdd. These devices are rarely 
repaired. 
There are three main parameters to consider when choosing a hard drive: 
1. Interface type. 
Your driver must be fully compatible with the motherboard. There are different 
interface options: SCSI, SATA, IDE and SAS. IDE connection is suitable only for old 
computers. Currently, different versions of SATA are often used. Modern interfaces for 
connecting drives allow you to work with files faster. 
2. Performance. 
The speed of the disk is affected by the speed of rotation of the shaft. There is a 
standard rotation speed: from 5400 to 7200 rpm. How to make the right choice? 5400 rpm 
is enough to save data, if you need to install systems and programs, you should choose a 
screw with parameters of -7200 rpm. "Green" drives with a speed of 5400 revolutions per 
minute are characterized by low energy consumption and quiet operation. A large number 
of revolutions provides greater reading and writing speed. 
There are models with speeds from 10,000 to 15,000 rpm. For servers and 
professional use only. 
Intermediate memory buffer - cache also affects the performance of the internal hdd. 
Cache values range from 8 to 64 MB. The larger the cache, the faster the screw works: 
- 8 MB is enough for 500 - 750 GB; 
- 16 MB - for 1 TB. 
3. Opportunity. 

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