hdd is a mechanical hard drive. The full name of mechanical hard disk in English is "Hard Disk Drive", or "HDD" for short. The reason why it is called mechanical hard disk is because it is completely made of mechanical structure inside. A mechanical hard disk is mainly composed of a platter, a magnetic head, a platter shaft, a control motor, a magnetic head controller and other mechanical devices. Mechanical hard drives are located in dust-free factories throughout the production process. Any tiny particle of dust falling on the disk surface will have a devastating blow to the entire disk when it is working at thousands of revolutions per minute.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
hdd is a mechanical hard drive.
Mechanical hard disk (Hard Disk Drive, HDD) is a traditional ordinary hard disk, which mainly consists of: platter, magnetic head, platter shaft and control motor, magnetic head controller, data converter, interface, cache, etc. Made up of several parts.
The magnetic head can move along the radius of the disk. Coupled with the high-speed rotation of the disk of several thousand revolutions per minute, the magnetic head can be positioned at a designated position on the disk to read and write data. Information is written to the disk through a magnetic head that is very close to the magnetic surface, and the electromagnetic current changes the polarity and is written to the disk. The information can be read in the opposite way. As a precision device, dust is the enemy of the hard disk, so the air entering the hard disk must be filtered.
All the platters in a mechanical hard disk are mounted on a rotating shaft. Each platter is parallel to each other. There is a magnetic head on the storage surface of each platter. Between the magnetic head and the platter The distance is only 0.1μm~0.5μm, and the higher level has reached 0.005μm~0.01μm. All the magnetic heads are connected to a magnetic head controller, and the magnetic head controller is responsible for the movement of each magnetic head. The reading and writing speed of a mechanical hard disk depends on the speed of the motor, because the motor needs to be relied on to drive the disk to rotate at high speed so that the magnetic head can find the designated position for reading and writing.
Mechanical hard drives are located in a dust-free factory during the entire production process. Any tiny particle of dust falling on the disk surface will cause damage to the entire disk under its working status of thousands of revolutions per minute. They are all devastating blows. Common mechanical hard drives have 5400 rpm and 7200 rpm, so friends, please do not dismantle the mechanical hard drive by yourself.
There are many small grids on the disk surface. When the mechanical hard disk is working, the magnetic head will float on the disk surface to read the data in the small grids on the disk. Rather than saying that the magnetic head is reading data, it is better to say that the magnetic head is reading the magnetism of the small grid. Each small grid is composed of small magnetic particles. The magnetic particles can show different magnetisms. The two different directions of magnetism correspond to 0 and 1 in computer binary, so that the magnetic head can read data. When writing data, the write head can change the polarity direction of the small magnetic particles in the small grid, thus writing the data to the disk.
The difference between mechanical hard drive and solid state drive
Hard drive can be divided into mechanical hard drive (HDD) and solid state drive (SSD), take a look below Comparison of the advantages and disadvantages of mechanical hard drives and solid-state hard drives
1. Shock and drop resistance: Mechanical hard drives are all disk-type, and data is stored in disk sectors. The solid-state drive is made of flash memory particles (i.e., memory, MP3, U disk and other storage media), so there are no mechanical parts inside the SSD solid-state drive, so it will not be affected even when moving at high speed or even with flipping and tilting. to normal use, and can minimize the possibility of data loss in the event of collisions and shocks. Compared with mechanical hard drives, solid hard drives have an absolute advantage.
2. Data storage speed: The speed of mechanical hard disk is about 120MB/S, the speed of SATA protocol SSD is about 500MB/S, and the speed of NVMe protocol (PCIe 3.0×2) SSD is about 1800MB/S. S, the SSD speed of NVMe protocol (PCIe 3.0×4) is about 3500MB/S.
3. Power consumption: The power consumption of solid-state drives is also lower than that of mechanical hard drives.
4. Weight: Solid-state drives are lighter in weight, 20-30 grams lighter than conventional 1.8-inch hard drives.
5. Noise: The mechanical hard disk needs to rotate the disk at high speed when working. The high-speed rotation of the motor inevitably brings noise and heat. Since solid-state drives have no mechanical parts or flash memory chips, they have the characteristics of low heat generation and fast heat dissipation. They also have no mechanical motors and fans, and the noise level is 0 decibels.
6. Maintenance and optimization methods and performance: The structure of mechanical hard disk determines that there are not many ways to optimize it, while solid-state hard disk can be optimized in many more aspects.
Summary:
The advantages of mechanical hard drives over solid-state drives are large capacity, affordable price, and relatively easy data repair, but there are also many shortcomings, such as transfer rate. Relatively low, poor shock resistance, relatively large power, relatively large weight and volume, etc.
Compared with mechanical hard drives, solid-state drives have advantages such as fast speed, small size, and easy installation. The disadvantages are that the price is high, the heat is relatively large, and it is more troublesome to repair data after it is damaged.
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