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The head MR. is one of the three types of play-back heads existing on the hard drives.
MR. means MagnetoRésistive
This system of reading uses in fact two play-back heads: for the writing and for the reading, that of reading being based on a new principle.
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In reading mode:
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the magnétorésistive head is reserved for the reading. In the presence of a magnetic field, its electrical resistance is modified. These changes, detected, make it possible to know the information recorded on the disc.
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In writing mode:
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a inductive Tête is in charge of the writing.
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