The hard drive uses two important principles about the magnetic fields.

The hard drive uses two important principles about the magnetic fields.

Length: 842 words (2.4 double-spaced pages)

Rating: Excellent

Open Document

Essay Preview

More ↓
The hard drive uses two important principles about the magnetic fields.
When we write data onto the hard drive Cit uses the law of electromagnetic
induction and some material is magnetic.

The hard drive uses two important principles about the magnetic
fields.

When we write data onto the hard drive it uses the law of
electromagnetic induction and some material is magnetic.

When we read data from the hard drive, it uses the Lenz's law.

How hard disk drive works:

Firstly we should know the two important part of the hard disk drive,

1. platters and media

We put all of the data onto the platters. They are inside of the hard
drive. There are several pieces of platter in the hard disk drive,
maybe three or four. They are made of special material. The material
must be strong and light. Because there are high rotation rates, when
the hard disk drive working. Traditionally, people often use aluminum
because it is a light material. But today, most platters are made from
material like glass or ceramic composite. These light, strong
materials have a very low thermal expansion, and compare to aluminum.
They can withstand higher forces. So the platters can run faster.
Older hard disk drive can only run at 3600 to 5200 rpm. Today's ones
can run7600 to 10000 rpm.

There is a layer of magnetic material on the surface of the platters.
Today a thin-film media is used here. Thin-film media is a microscopic
layer of pure metal bonded to the substrate surface through an interim
layer. Because the distance between head and platters is very small
(about 10 micro inches), but they can not touch with each other. So
the thin-film media is very flat and is coated with a protective layer
to help survive head crashing.

2. the arm and read and write head

The arm that holds the read/write heads is controlled by the mechanism
in the upper-left corner, and is able to move the heads from the hub
to the edge of the drive. The arm and its movement mechanism are
extremely light and fast. The arm on a typical hard-disk drive can
move from hub to edge and back up to 50 times per second. It is hard
to believe. But it is the truth.

Simply, The read and write head is a ferromagnetic core. It can
product a variety magnetic fields through a variety current to be able
to write data onto the media in ASC2. And also can product variety
current though inducing the variety magnetic field on the surface of
the platter to read data from the hard disk drive.

How to Cite this Page

MLA Citation:
"The hard drive uses two important principles about the magnetic fields.." 123HelpMe.com. 05 Dec 2019
    <https://www.123helpme.com/view.asp?id=48683>.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Interstellar Magnetic Fields And Gases Essay example

- Interstellar Magnetic Fields and Gases Interstellar magnetic fields play an important role in our galaxy by returning stellar material back out into interstellar space. The magnetic fields are frozen in place within the hot ionized gases of the interstellar medium acting as an additional energy reservoir; the magnetic fields wear several hats regarding the work that needs to be done in our galaxy. However, there is still little known about the all of the roles the ISMF plays. There is a division between large and small scale fields; the former found on the scales of the spiral arms of our galaxy, and the latter found within the interstellar space....   [tags: Magnetic field, Magnetism, Electromagnetism]

Research Papers
1687 words (4.8 pages)

The Earth Magnetic Field Essay

- It’s the magnetic field that extends from the earth’s interior to where it meets the solaria stream of charged particles emanating from the sun. The magnetic field resembles the field of a large bar magnet near its center or that due to a uniformly magnetized sphere. Its origin is thought to be generated deep down in the earth’s core. At the surface of the earth, the pole of this equivalent bar magnet, nearest the north geographical pole is actually a south” magnetic pole. This paradoxical situation exists since by convention a north seeking end of a compass needle is defined as pointing north yet must point to a pole of opposite sense or South Pole of the earth’s magnetic field....   [tags: solaria stream, magnetic storms]

Research Papers
1754 words (5 pages)

Active vs. Passive Magnetic Bearings Essay

- Introduction A magnetic bearing is a type of bearing that holds up a load using magnetic levitation. Scientists first discovered the magnetic effects in magnetic minerals in 500B.C. In the late 20th century, scientists began developing ways where this magnetic effect could be implemented into a bearing, creating magnetic bearings. Today, magnetic bearings can be found in many applications where no physical contact is required or extreme environmental conditions exists, including very high and low temperatures....   [tags: magnetic levitation, minerals]

Research Papers
1669 words (4.8 pages)

Essay on The Effects Of Magnetic Permeability On The Magnetic Field

- Aeromagnetic Data Theory Scalar aeromagnetic data reflect both induced and remanent magnetic fields. Induced magnetism is caused by the earth’s magnetic field and is mainly the result of the magnetic susceptibility of the rock. Magnetic susceptibility is expressed as a unit-less proportionality constant denoted by an International System of Units (SI), which simply reflects the susceptibility of a rock to become magnetized in the presence of a magnetic field. This susceptibility is mainly a function of the rock’s magnetite content....   [tags: Magnetic field, Magnetism, Igneous rock]

Research Papers
1757 words (5 pages)

Essay on The Effects Of Magnetic Permeability On The Magnetic Field

- Aeromagnetic Data Theory Scalar aeromagnetic data reflect both induced and remnant magnetic fields. Induced magnetism is caused by the earth’s magnetic field and is mainly the result of the magnetic susceptibility of the rock. Magnetic susceptibility is expressed as a unit-less proportionality constant denoted by an International System of Units (SI), which simply reflects the susceptibility of a rock to become magnetized in the presence of a magnetic field. This susceptibility is mainly a function of the rock’s magnetite content....   [tags: Magnetic field, Magnetism, Igneous rock, Basalt]

Research Papers
1544 words (4.4 pages)

Essay on Why Earth 's Magnetic Shield Matters

- Why Earth 's Magnetic Shield Matters Prompt #1: Did it surprise you to know how much our magnetic field protects us?  Yes, it surprises me, I did not expect that the magnetic field was an essential key for organic life. I think this is an essential aspect to find a new ex-planet that can hold the future of humanity. How do you think life on Earth would be affected if magnetic field weakened significantly?  I think, if the magnetic field weakened significantly, the life would evolve considerably adapting to the new earth conditions....   [tags: Earth, Solar System, Earth's magnetic field, Sun]

Research Papers
762 words (2.2 pages)

Magnetic Disks Essay

- Magnetic Disks (Hard Disk) The topic of magnetic disks is one that involves many physics related phenomenon. The intricate structure and design of “Magnetic Disks” (or hard disks) in computers include the principles of Fluid Flow, Rotational Motion, Electromagnetism, and more. This paper will focus mainly on the previously listed physics occurrences, and the design that goes into engineering the magnetic disk to include them. These physics principles are utilized in such a way that makes the hard disk a very common and useful tool, in this day and age....   [tags: essays research papers fc]

Free Essays
1175 words (3.4 pages)

Magnetic Fluids Essay example

- 1.1 PRELUDE: The phenomenon of ferromagnetism is associated only with the solid state of matter; like iron, nickel, cobalt and some rare earth metals and their alloys. Thus, up to now, there is no intrinsic homogeneous fluid having ferromagnetic properties; although, theories admit the possibility of ferromagnetism in the liquid state, and suggest that there is no inherent reason why they should not exist [1-3,5]. Ferromagnetism occurs when paramagnetic ions in a solid lock together in such a way that their spins all point (on the average) in the same direction ....   [tags: GCSE Chemistry]

Free Essays
1353 words (3.9 pages)

Magnetic Systems Essay

- For Levitation In ancient times men knew of a special kind of rock that could pull other rocks of the same kind and pieces of iron toward themselves. Such rocks were called lodestones. Today man uses the same force exerted by electromagnets and permanent magnets to provide magnetic aide to trains and more efficient power generators. This report will focus on the use of magnets in the generation of electricity and magnetically aided trains. Magnetism is defined as the force exerted by a magnetic field....   [tags: Free Essay Writer]

Free Essays
1041 words (3 pages)

Magnetic Therapy Essay

- Magnetic Therapy As we continue to develop as a society, more and more people are looking for newer methods to help themselves become and stay healthy. One of the ways we have done this was to emulate remedies of the past. A good example of this would be the use of magnets. Magnets were used in early civilizations across the globe. The use of magnets has been found in medical journals of the early Chinese. The Ancient Greeks used magnetic rocks, lodestone, as a healing tool (http://www.magicnet.net/~daw/html/modern.html)....   [tags: Medicine Medical Papers]

Free Essays
2413 words (6.9 pages)

Related Searches



Secondly, we should know how they work together.

Whenever reading or writing, the platters are rotated at a high speed.
The head and the media never touch with each other. Even if they are
working. Because a little touch can cause an immense damage of head
and the media` surface. When they are working, read and write head are
made to float above a platter surface by suspending the heads on a
layer of moving air. Just like the airplane flying in the air. But the
plane does not move, the air moves. Platter rotation creates a slight
cushion that elevates the heads. That is why all hard drives seal
their platter assemblies into an airtight chamber. The reason for such
a seal is to prevent dust, dirt, spill or stands of hair. Once they
land on a platter` s surface, it can easily result in a head crash. A
head crash can damage the head, the media, or both, and physical
damage can result in an unusable drive.

When you want to read data from the hard drive. First the heads move
to the area where you put your data. And then the head can induce the
variety magnetic fields and turn them into variety current and the
variety current is translate into the ASC2 code , at last the code is
sent to the CPU. The hard disk drive is done.

When you want to write the data on the media, the posses almost is the
same. But the principle is opposite. This time the hard drive receive
the code from the CPU and translate it into variety current and the
variety current product variety magnetic fields though the read and
write head to made the media magnetic.

What careers are related to the use of the technology?

Electronic design engineer: the engineer can design better read and
write head for the hard drive.

Structural engineer: the platter run very fast so a good structure for
the hard drive is very important.

Mechanical engineer: the motor need improve endlessly with the higher
rotation of the platter. The more advanced axletree should be found,
which can produce less heat.

Material engineer: find better magnetic material for the hard drive.
Make the thin-film media technology more mature.

Aerostatic engineer: calculate the air flow in the hard drive. Make
the arm be right height up the platter when the platter is at
different speed.
Return to 123HelpMe.com