Data Encoding and Decoding Of Hard Disk
Digital information is a stream of ones and zeros. Hard
Magnetic information on the disk consists of a stream of (very, very small) magnetic fields. As you know, a magnet has two poles, north and south, and magnetic energy (called flux) flows from the north pole to the south pole. Information is stored on the hard disk by encoding information into a series of magnetic fields. This is done by placing the magnetic fields in one of two polarities: either so the north pole arrives before the south pole as the disk spins (N-S), or so the south pole arrives before the north (S-N).
Although it is conceptually simple to match “0 and 1” digital information to “N-S and S-N” magnetic fields, the reality is much more complex: a 1-to-1 correspondence is not possible, and special techniques must be employed to ensure that the data is written and read correctly. This section discusses the technical issues involved in encoding and decoding hard disk data.
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