Magnetic disks are the standard storage unit used to store information on a computer. But in addition to information it is also an influencing factor in PC performance. Find out what they are for, how they work and the characteristics of a magnetic disk.
What are magnetic discs?
The magnetic disk or hard disk is a data storage device and it is the device used by computers. To store information, it uses a magnetic recording system.
It is considered a non-volatile device because the information is kept permanently stored even though the electrical current is interrupted. It is made up of one or more small rigid disks that are inside a box.
What are magnetic discs for?
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Each of the platters on the disc are double-sided which are used for information storage. It is the hard drive where it is usually install the computer’s operating system and it is where the files necessary for its operation are kept.
In addition to the disc works as a secondary memory of the PC, in other words, it contains the data that the RAM memory needs to send and receive requests to the processor. If the computer is turned off, the files in the RAM memory are erased because it is volatile memory, but the data on the hard disk remains.
All the files of the computer user can be contained in the hard disk since it is a unit that covers a lot of storage space. It is what differentiates it from other storage devices such as optical discs.
How do magnetic discs work?
Viewed from the outside, the hard drive is a metal case with various connectors and electrical components. But inside the box are some discs called plates that have double sides to store information.
The chainrings are linked by a shaft that allows them to rotate at high speed and stay together. The internal discs can rotate at a speed of up to 9600 revolutions per minute.
Each of the platters has its own Reading and writing than with handled by means of an electromagnet. These heads are responsible for storing the data on the disk. The heads do not touch the discs to save the information thanks to their electromagnetic operation.
Dishes are usually very fragile and can be damaged by dust or moisture particles. It is for this reason that they are sealed in an airtight container, because even if the heads were to rust, the reading and writing process would be affected.
Another factor that could affect the performance of a disc is overheating and magnetism. That is why the container box for dishes is usually made of aluminum, since it is a non-magnetic metal and helps to maintain the temperature of the dishes.
So that the hard disk can communicate with the other components of the computer it has an electronic circuit. It also has the connectors to place the data cable that connects to the motherboard and the cable that connects to the power source.
Characteristics of a hard drive
- May store large amounts of information in comparison or other storage units. If a cost-value relationship is made, the hard disk is the device that has the greatest storage capacity at the best cost.
- It is not volatileTherefore, when the power is disconnected, the data remains on the disk.
- It is the secondary memory of the computer. It is responsible for saving data necessary for the operation of the computer and communication between the hardware components.
- Quick access to information, you can quickly search for information on the disk by accessing the drive and searching for the file by name.
- Stores all the programs on a computer. All the files necessary for the programs to run are on the hard drive.
- There are fixed hard disk versions, which are those found inside the PC and removable ones that can be disassembled and transport to be used on another PC.
- Can be used as virtual memory, to help main memory run more processes.
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