What is the abbreviation of mechanical hard drive?

The abbreviation of mechanical hard disk is HDD (Hard Disk Drive), which mainly consists of: platter, magnetic head, platter shaft and control motor, and magnetic head controller , data converter, interface, cache and other parts. The advantage of using it is that the unit cost is low and it is suitable for large-capacity storage, but the read and write speed is far inferior to SSD. (Recommended learning: Web front -end video tutorial )

Magnetic head can move along the radius of the plate, plus a high -speed rotation of thousands of rpm per minute, the magnetic head can be possible Position the disk at a specified location to read and write data.

The information passes through the magnetic head very close to the magnetic surface, and the electromagnetic current changes the polarity and is written to the disk by the electromagnetic current. 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 smaller than the diameter of a human hair. All the magnetic heads are connected to a magnetic head controller, which is responsible for the movement of each magnetic head.

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: Judging from the evaluation data of the PConline evaluation room, the performance of solid-state drives is more than 2 times higher than that of mechanical hard drives.

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: Since Solid Hardware has no mechanical parts and flash memory chips, it has the characteristics of low heat generation and fast heat dissipation. It also has no mechanical motors and fans, and the operating noise value is 0 decibels. Mechanical hard drives are much inferior.

6. Price: As of now (2018/11/20), the brand’s 128Gb solid-state drive is about 150 yuan. The price of a 1Tb mechanical hard drive is only about 280. Solid state drives are more expensive than mechanical hard drives and have lower cost performance.

7. Capacity: The current maximum capacity of SSD is 100TB 3.5 inches

8. Service life: SLC has only a read and write life of 100,000 times, while low-cost MLC has a read and write life of only 10,000 times. Therefore, compared to solid-state drives, mechanical hard drives have a longer lifespan.

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