What is the structure of a computer hard drive?

8дТ13Ше 21:03 Install the partition and system of the large hard disk first, use the location of the original small hard disk, remove the small hard disk and hang it on the position of the optical drive, remove the optical drive, and then you can transfer the files of the original hard disk to the new hard disk.

It consists of one or more discs made of aluminum or glass. These discs are covered with ferromagnetic material.

The vast majority of hard drives are fixed hard drives that are permanently sealed and fixed in the hard drive. Early hard disk storage media were replaceable, but today's typical hard drives are fixed storage media that is enclosed in the hard drive (except for a filter hole to equalize air pressure).

Computer hard drives are made from a variety of materials.

Mechanical hard disk platters are made of alloy materials, mostly aluminum alloys, and the surface is coated with magnetic materials.

SSDs use ultra-large scale integrated circuits, and the main material is high-purity silicon.

A computer's hard disk is the most important storage device for a computer. Hard disk drive (known as hard disk drive, abbreviated as HDD) consists of one or more aluminum or glass discs.

These discs are covered with ferromagnetic material.

Mechanical hard disks are all aluminum alloys. High-purity silicon for SSDs.

A variety of accessories are purchased by the hard disk manufacturer and assembled on the production line.

What does it mean to have a stock as large?

In terms of cost performance, flash memory is more recommended, and the program read and write speed, and boot speed will be significantly improved.

In this case, it is recommended that you buy a 500g or 1t mobile hard drive, as an expansion of space, the most cost-effective.

The 750 mechanical hard disk is not recommended, the speed is slow, but the capacity is large.

I used a 1T mobile hard drive for more than 500 silver, which is about the same size as Note2. It's very convenient. Hope.

The hard disk in a computer consists of one or more discs made of aluminum or glass, and these discs are covered with a ferromagnetic material.

The vast majority of computer hard drives are fixed hard disks that are permanently sealed and fixed in the hard drive. A computer hard disk is mainly composed of a head, a track, and a cylinder. The details are as follows:

1. MR head.

The MR head can sense the amplitude of the signal by changing the resistance rather than the current, so it is quite sensitive to signal changes and the accuracy of reading data is correspondingly improved. And because the amplitude of the read signal is independent of the track width, the track can be made very narrow, which increases the platter density to 200MB inches2, compared to 20MB inches2 with conventional heads.

2. Magnetic track. The surface of the disk is coated with a magnetic medium used for record-keeping purposes, and it appears as magnetic particles under a microscope. The polarity of the tiny magnetic particles can be changed rapidly by the magnetic head, and can be stably maintained after the change, and the system can distinguish 0 or 1 in the binary by the change of magnetic flux and magnetic resistance.

Each track on the disk is divided into a number of arcs, which are the sectors of the disk, and each sector can hold 512 bytes of information, and the disk drive reads and writes data to the disk in sectors. Inch floppy disk, each track is divided into 18 sectors.

3. Cylindrical surface. A hard disk is usually made up of a set of overlapping platters, each of which is divided into an equal number of tracks and numbered from the "0" on the outer edge, with tracks of the same number forming a cylinder called the cylinder of the disk. The number of cylinders on a disk is equal to the number of tracks on a disk.

Each disc has its own head, so the number of discs is equal to the total number of heads.

No matter what kind of hard disk, it is composed of several parts, such as platter, head, platter spindle, control motor, head controller, data converter, interface, cache, etc. All platters are fixed on a rotating axis, which is the platter spindle. All the platters are absolutely parallel to each other, and on the storage surface of each platter there is a head, and the distance between the head and the platter is smaller than the diameter of a human hair.

All heads are connected to a head controller, which is responsible for the movement of each head. The head moves along the radius of the platter, which rotates at high speed at a speed of thousands to tens of thousands of revolutions per minute, so that the head can read and write data to a specified position on the platter. Since hard drives are delicate devices and dust is their enemy, they must be completely sealed.

On the front of the hard disk are labeled with the hard disk, the label is generally marked with the information related to the hard disk, such as product model, origin, factory date, product serial number, etc., the above picture is the product label of WD200BB. At one end of the hard drive, there is a power interface socket, a master-slave setting jumper, and a data cable interface socket, while on the back of the hard disk is the control circuit board. The location of each component can be clearly seen from the diagram below.

A shell, a magnetic sheet, a magnetic head, a motor, a PCB board, and that's it.