Thursday, February 14, 2019
The hard drive uses two important principles about the magnetic fields. :: Computer Science
The large(p) stupefy uses both important principles about the magnetic fields. When we write data onto the toilsome engage Cit uses the law of electromagnetic induction and some material is magnetic.The hard drive uses two important principles about the magneticfields.When we write data onto the hard drive it uses the law ofelectromagnetic induction and some material is magnetic.When we direct data from the hard drive, it uses the Lenzs law.How hard platter drive works first of all we should know the two important part of the hard disk drive,1. platters and mediaWe instal all of the data onto the platters. They ar inside of the harddrive. There are several pieces of platter in the hard disk drive,maybe trey or four. They are made of special material. The materialmust be strong and dim. Because there are high rotation rates, whenthe hard disk drive working. Traditionally, people often use aluminumbecause it is a light material. But today, most platters are made frommaterial like icing or ceramic composite. These light, strongmaterials have a very pocket-sized thermal expansion, and compare to aluminum.They stooge withstand higher forces. So the platters layabout run faster.Older hard disk drive endure scarcely run at 3600 to 5200 rpm. Todays onescan run7600 to 10000 rpm.There is a forge of magnetic material on the move up of the platters.Today a thin-film media is utilise here. Thin-film media is a microscopic floor of pure metal bonded to the substrate surface through an interimlayer. Because the distance between coping and platters is very small(about 10 micro inches), but they can not touch with each(prenominal) other. Sothe thin-film media is very flat and is coated with a protective layerto help survive head crashing.2. the arm and need and write headThe arm that holds the read/write heads is controlled by the mechanismin the upper-left corner, and is satisfactory to move the heads from the hubto the edge of the drive. The arm and i ts movement mechanism are super light and fast. The arm on a typical hard-disk drive canmove from hub to edge and back up to 50 times per second. It is hardto believe. But it is the truth.Simply, The read and write head is a ferromagnetic core. It canproduct a variety magnetic fields through a variety current to be ableto write data onto the media in ASC2. And also can product varietycurrent though induce the variety magnetic field on the surface ofthe platter to read data from the hard disk drive.
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