What Is a Disk Sector?

The hard disk sector is the internal circular metal disk of the hard disk divided into several fan-shaped areas by the track. This is the hard disk sector. Several sectors make up the entire disc, and the hard disk read and write takes sectors as the basic unit. This mechanism with clusters as the smallest allocation unit makes it relatively easy for the hard disk to manage data.

Hard disk sector

Why should the hard disk be divided into sectors? Is the need for logical data, can better manage hard disk space. With the center of the disc as the circle center, the disc is divided into several concentric circles, and each "line" that divides the circle is called

Today's hard disks use ZBR (Zone Bit Recording) technology. The disk surface is divided into several areas from the inside to the outside. The number of track sectors in different areas is different. The number of track sectors in the same area is the same. The number of long track sectors in the circle area is relatively large, and the number of short track sectors in the inner circle area is relatively small. Generally, the same density is achieved, thereby obtaining more storage space. Most products are divided into 16 areas, and the number of sectors per track in the outermost circle is exactly twice that of the innermost circle (373 ~ 746 is exactly right). In this case, when the spindle motor of the disk rotates at a certain speed (N revolutions per second), the further out, the higher the linear speed, the more sectors scanned in a unit time, and the higher the read and write speed. (This is why the system disk data is usually placed in the outermost circle of the disk ~~)