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

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.

Aim of Education Essay

The main aim of education is the all-round development of a student. Its purpose is to develop a student into a full, whole and integrated person. Thus, the objectives to be achieved through education and training are many and comprehensive. Education helps in achieving and developing skills, abilities, insights and scientific temper. Besides literary and aesthetic appeal of education, there are utilitarian aspects as well and they are equally important. Education aims at developing and bringing out the best of a student’s inner personality, without neglecting the outer and material aspects. Education also means that students are made capable of standing on their own feet, to earn their bread and butter. An educated person is supposed to face the challenges of life bravely and successfully. No person can be called properly educated if he or she fails in making a meaningful contribution to the society and country. The purpose of education is to strike a proper balance between i nner and outer emotional and practical aspects of one’s personality and life. If it is not done, it will result in an imbalanced development of a personality. It should help in flowering of both the spiritual and physical potentialities. All- round development means the growth and development of mind, spirit and body. All these are integral and interdependent aspects of a one’s personality. It only means that there should be integrated development and none of these aspects should be neglected. Man is emotional as well as rational and both these aspects should be properly developed so as to form parts of an integrated and organic whole. The development of the one at the expense of the other will result in disaster. Man is neither a thinking machine nor a heap of emotions; he is not a bundle of flesh and bones. If one is guided simply by emotions, one’s vision is bound to be distorted. Similarly, if one goes by reason alone then one would be a mere thinking robot.The main task of education is to produce useful, intelligent, patriotic, emotionally integrated, morally strong, cultured, scientifically tempered and healthy young men and women. In short, the aim and objective of education should be proper integration and harmony between feeling, thinking and doing. Education should produce people properly adjusted with the rhythm of life, and this cannot be achieved unless there is the much desired adjustment between rhythms of mind and heart in the individual. One of the primary aims  of education is to develop character. Now, character is a very comprehensive term and means not only pattern of behaviour of an individual but also moral strength, mental presence, self-discipline, fortitude, and reputation, etc. Most of our modern problems have their origin in our lack of strong moral character. The modern age has been suffering from the crisis of character. If the character of the people is improved, many of the problems would take care of themselves. If the character of the people of a country is strong, it will be very easy to overcome any crisis, however great. It is said that if character is lost, everything is lost. What makes a man, really a man in the true sense of the term, is his character.Without character a man is nothing but a beast, a mere organism, just existing selfishly without any values and ethical sense. According to a poet, â€Å"Sow a habit and you reap a character. Sow a character, and you reap a destiny.† Thu s, the men of character are the men of destiny. Only those with strong moral characters have capabilities to control and guide the destinies of nations and the world. Mahatma Gandhi was such a man of character and so also a man of destiny. So were Go hale, Tilak, Rajendra Babul, Vivekananda and Sub hash Bose. The aim of education should be to make our students follow in the footsteps of these men of strong character and destiny. The education imparted in our schools, colleges and universities should be such as to mould the personalities of the students, to enable them to face the realities of life with courage and confidence. In this context, the valuable concept of Basic Education championed by Mahatma Gandhi comes to mind. Basic education means that it should be based on work experience. It should not be theoretical and isolated but intimately related with a student’s social and family background and relevant to the needs of the society.Work and training should form an integral part of education and not be an isolated activity. It should aim at producing artisans, craftsmen, doctors, engineers, technicians, teachers and other such professionals who may set up their own workshops, factories, mills, dispensaries, and schools, etc. and also fill up the vacant posts advertised by the government and other agencies. It only means that education should be work and employment-oriented. The essence of educat ion and training lies in the removal of unemployment by producing skilled, talented and well-trained personnel and professionals. One of the main purposes of education should be to equip the people with means to face  the problem of unemployment. No education worth its name can divert itself from the responsibility of providing suitable careers to people. This utilitarian aspect of education is as important as that of emotional and spiritual development. Education should also aim at achieving national integration and generation of stronger sense of unity and oneness among the people.In a country such as India, with such diversity, it becomes all the more vital. Every educated man and woman in India should be imbued with the sense of pride and honour for our common heritage, culture and history. It is this oneness of culture and heritage that has always stood us in good stead in times of crisis and catastrophe as a nation. Whether it was the Chinese aggression, Pakistani attacks or any other crisis, the whole nation rose like one to face it successfully. The cultural and emotional integration, effected through true and purposeful education, can very easily affect the singleness of purpose, leading to desired results.The develo ped and advanced countries like Japan, Canada, France, Germany, and America, etc. are so, because they have been continuously investing heavily in education for the last many years. This clearly shows that education is an essential investment and input to realize the optimum output. The long term returns and benefits of investment in education, training and human resource development have been quite phenomenal, as is evident from the fantastic growth and development of these nations. Obviously, a purposeful education makes human resources and capital far Yore dividend paying than it would be otherwise. Good moral character, scientific temper, self-dependence, patriotism, social and environmental awareness, single-nests of purpose, secular and broad outlook, fortitude and sense of human values, like compassion, truth, peace, non-violence, and charity, are some other aspects of education.

The Battle Of Antietam By Robert E. Lee - 1046 Words

The Future of America, its citizens, and its enslaved people hinged on the outcome of the American Civil War. The Civil War was fought between the North (Union) and the south. The Battle of Antietam took place on September 17, 1862 near Sharpsburg, Maryland, and it was the bloodiest day in American history. Before the battle, the confederacy had a better chance of winning the war. Conflict arose between McClellan and Robert E. Lee which sparked the invasion of the north and the beginning of a long war. McPherson argued in his novel that the battle of Antietam was the turning point of the Civil War. In the beginning of the novel, McPherson informs the reader that it was not clear who would win the war. Both side had strengths and weaknesses that set the scene of the war. Before Antietam only the South thought the war was about slavery .The North simply was fighting to â€Å"preserve the Union†, not to abolish slavery. The war was described as, â€Å"A war to destroy slaver y and to reshape the South in the Northern free-soil image† (McPherson 14-15). Since the north did not have slavery, the south wanted to keep it. The south was close to being recognized by England and France, â€Å"The South’s principal foreign-policy goals were European intervention to break the blockade and diplomatic recognition of the Confederacy as a nation† (McPherson 35). Southerners believed in cotton to compile British and French Intervention. The textile industry was the leading sector in the British andShow MoreRelatedThe Battle Of Antietam By Robert E. Lee1412 Words   |  6 PagesThe Battle of Antietam was battled on September 17, 1862. Union armed force led by General George B. McClellan battled against the Confederate Army led by General Robert E. Lee. The fight was battled along the Antietam Creek close Sharpsburg, Maryland. 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