The heads is a tool to read and write the platters and is one of the most precise parts of a hard disk. The heads are made by winding coils on a magnetic core. When a hard disk works, the heads read data from the disk by inducing changes of the magnetic field on the platters and write data into the disk by changing the magnetic field. To prevent headers and platters wear-out, the spindle motor drives the platters to rotate at a high speed. The generated buoyancy makes the heads float above the platters, not touching the platters. The spindle motor leads the sector storing data to be read or written beneath the heads. After the device is powered off, the heads automatically return to a fixed position on the disk (the position is called the landing zone, which is the start position of the disk and does not store data). The PCBA drives the heads to work. Due to the mechanical-electrical structure and working principle, hard disks fear shock and static electricity. Hard disks are precision equipment. Improper use may damage hard disks and cause data loss. Exercise caution when using hard disks.
