Why can a hard drive store things? What material is it made of?

It is made of sheepskin, and when you store something, it is an automatic needle engraved on the sheepskin, which is how the hard disk works.

Hard disk drive (hard disk drive, abbreviated as HDD full name Winchester hard drive) consists of one or more aluminum or glass discs. These discs are covered with ferromagnetic material.

The external structure of the hard disk mainly includes three parts: the metal fixed panel, the control circuit board and the interface.

As the data storage of a computer system, capacity is the most important parameter of a hard disk. The capacity of a hard drive is measured in megabytes (MB) or gigabytes (GB), 1GB = 1024MB, 1TB = 1024GB. However, hard drive manufacturers usually take 1g = 1000MB when the nominal capacity of the hard drive is not cracked, so the capacity we see in the BIOS or when formatting the hard drive will be smaller than the manufacturer's nominal value.

Pro, how does the hard disk store the pressure of data: the hard disk is not directly stored in the data we see now, in the computer, through the binary system, the data is converted into the number of spring spike data that can be represented in binary, and then the high level and low level of the machine can be used in the state of two physical states of the machine. The principle of storing data on a hard disk is similar to that of a cassette tape, except that the data stored on the cassette is in analog format**, while the hard disk is stored in digital format.

When writing, an electric force is applied to the head coil, which generates a magnetic field around it and magnetizes the magnetic material underneath; The direction of the current is different, so the direction of the magnetic field is also different, which can represent the difference between 0 and 1. When reading, the magnetic head coil cuts the magnetic field line and generates an induced current, and the direction of the magnetic field of the magnetic material is different, so the direction of the induced current generated is also different. Precautions for the use of extended data hard drives:

1. Don't shut down suddenly when working. If we suddenly turn off the power halfway, it may cause the head to rub violently against the platter and damage the hard disk, so avoid sudden shutdown. When shutting down, be sure to pay attention to whether the hard disk indicator on the panel is still flashing, and only when the indicator stops flashing and the hard disk reads and writes is over, you can turn off the computer's power switch.

2. Prevent dust from entering. The damage of dust to the hard disk is very large, this is because in the environment of serious dust, the hard disk is easy to attract dust particles in the air, so that it accumulates on the internal circuit components of the hard disk for a long time, which will affect the heat dissipation of electronic components, so that the temperature of the circuit components will rise in the dust hall, resulting in leakage or burning components. 3. Prevent the temperature from being too high or too low.

Temperature also has an impact on the life of a hard drive. When the hard disk is working, it will generate a certain amount of heat, and there is a heat dissipation problem in use. The temperature should be 20 25, too high or too low will change the clock frequency of the crystal oscillator.

Temperature can also cause hard disk circuit components to malfunction, and magnetic media can cause recording errors due to thermal expansion effects.

In the early days, the platters of hard disks used plastic source materials as the platter matrix, and then coated with magnetic materials on the plastic substrate to form the platter of the hard disk. The use of aluminum as the hard disk platter substrate was subsequently introduced, and almost all IDE hard drives on the market today use aluminum hard disk platter substrate. The use of glass material as the platter matrix is the latest hard disk platter technology, which can make the hard disk smooth and more robust, and the glass material has higher stability at high speed of the hard drive.

IBM is a pioneer in using glass materials as the substrate for hard disk platters, and Fujitsu notebook hard disks also have corresponding glass material products.

Flash memory is a memory unit (flash memory) based on semiconductor media

There are currently two types of hard drives.

BAY1. The internal hard disk platter of the mechanical hard disk disk is based on a solid and durable material, and the magnetic powder is attached back to the surface of the aluminum alloy (new materials also use glass) disc, and the surface is processed quite smoothly. These magnetic particles are divided into a number of similarities called tracks.

The heart circle, on the track of each concentric circle, is like an infinite number of small magnets of any arrangement, which represent the states of 0 and 1 respectively. When these small magnets are subjected to a magnetic force from the head, the direction of their alignment changes.

2. The main body of the SSD is actually a PCB board, and the most basic components on this PCB board are the control chip, the cache chip and the flash memory chip used to store data.

The eighth element

The group owner helps you solve 3 problems in computer system, hardware, and games.

A platter is a medium that carries data storage in a hard disk, which is made up of multiple platters stacked on top of each other and separated by gaskets. Hard disk platters are based on durable materials with magnetic materials attached to them, and the surface is machined quite smoothly. Because the platter rotates at high speed inside the hard disk (5400 rpm, 7200 rpm, 10000 rpm, or even 15000 rpm), the hardness and wear resistance of the material used to make the platter are very high, so alloy materials are generally used, most of which are aluminum alloys.

Hard disk platters are constantly improving with the development of hard disks, and the early hard disk platters used plastic materials as the disk base, and then coated with magnetic materials on the plastic disk base to form the hard disk platter. Later, with the increase of hard disk speed and capacity, the metal disk base of the metal plate has a higher recording density, stronger hardness, and is stronger than the plastic disk base in terms of safety. At present, the mainstream hard disks in the market are made of aluminum metal disks.

IBM and other manufacturers have also launched "glass discs" based on quartz glass, but the initial glass discs are not properly handled in terms of heating and other technologies, resulting in some products are prone to failure in use. However, the glass disc is a more durable and durable disc material than aluminum, and the stability and reliability of the disc are improved when running at high speeds, and the surface of the glass disc is smoother, which is still technically ahead of the metal disc. Due to the huge density of records on the platter, and the high-speed rotation of the platter, in order to ensure the stability of its work and the long-term storage of data, the hard piece is sealed inside the hard disk.

Do not disassemble the hard disk by yourself, the dust in the air in the ordinary environment will cause permanent damage to the hard disk, and you should not touch the platter with instruments or fingers.

What does SSD mean when everyone says it, I'm going to tell you today.

The hard disk is a warehouse, and when needed, the data is taken out and put into memory for CPU computing, because the memory speed is much faster than the hard disk.

Differences:1Memory is closer to the CPU.

2.Speed: Memory" hard disk.

3.The storage medium is different, the memory is a flash memory chip, and the hard disk is a magnetic medium body4capacity, the memory capacity of the same ** bought is much smaller than that of the hard disk (because the cost of Article 3 is different)5

Power supply: The memory is about 2V, and the motor inside the hard disk needs to be about 12V, of course, the power of the hard disk is larger.

6.Interface: The memory is a bus slot, and the hard disk is IDE wiring or SATA serial port wiring.

View memory status:

Ctrl-Alt-Delete (hold down three keys at the same time), in the pop-up "Windows Task Manager" window, click "Performance", "Physical Memory", at a glance.