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Although the hard drive stores data in binary form, visualizing a magnetized spot representing a one and a non-magnetized spot representing a zero grossly oversimplifies the process Hard drives store data in tiny magnetic
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fields think of them as tiny magnets that can be placed in either direction on the platter, as shown in Figure 83 Each tiny magnetic field, called a flux, can Figure 83 Data is stored in tiny magnetic fields switch back and forth through a process called a flux reversal (see Figure 84) Electronic equipment can read and write flux reversals much faster and easier than it can magnetize or not magnetize a spot to store a one or a zero In early hard drives, as the read/ write head moved over a spot, the direction of the flux reversal defined a one or a zero As the read/write head passed from the left to the right, it recognized Figure 84 Flux reversals fluxes in one direction as a zero and the other direction as a one (Figure 85) Hard drives read these flux reversals at a very high speed when accessing or writing data Today s hard drives use a more complex and efficient method to Figure 85 Fluxes are read in one direction as 0 and the other direction as 1 interpret flux reversals using special data encoding systems Instead of reading individual fluxes, a modern hard drive reads groups of fluxes called runs Starting around 1991, hard drives began using a data encoding system known as run length limited (RLL) With RLL, any combination of ones and zeroes can be stored in a preset combination of about 15 different runs The hard drive looks for these runs and reads them as a group, resulting in much faster and much more dense data Whenever you see RLL, you also see two numbers: the minimum and the Figure 86 Sequential RLL runs maximum run length, such as RLL 1,7 or RLL 2,7 Figure 86 shows two sequential RLL runs Current drives use an extremely advanced method of RLL called Partial Response Maximum Likelihood (PRML) encoding As hard drives pack more and more fluxes on the drive, the individual fluxes start to interact with each other, making it more and more difficult for the drive to verify where one flux stops and another starts PRML uses powerful, intelligent circuitry to analyze each flux reversal and to make a best guess as to what type of flux reversal it just read As a result, the maximum run length for PRML drives reaches up to around 16 to 20 fluxes, far more than the 7 or so on RLL drives Longer run lengths enable the hard drive to use more complicated run combinations so that the hard drive can store a phenomenal
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amount of data For example, a run of only 12 fluxes on a hard drive might equal a string of 30 or 40 ones and zeroes when handed to the system from the hard drive The size required by each magnetic flux on a hard drive has reduced considerably over the years, resulting in higher capacities As fluxes become smaller, they begin to interfere with each other in weird ways I have to say weird since to make sense of what s going on at this subatomic level (I told you these fluxes were small!) would require that you take a semester of quantum mechanics! Let s just say that laying fluxes flat against the platter has reached its limit To get around this problem, hard drive makers recently began to make hard drives that store their flux reversals vertically (up and down) rather than longitudinally (forward and backward), enabling them to make hard drives in the 1 terabyte (1024 gigabyte) range Manufacturers call this vertical storage method perpendicular recording (Figure 87) For all this discussion and detail on data encoding, the day-to-day PC technician never deals with encoding Sometimes, however, knowing what you don t need to know helps as much as knowing what you do need to know Fortunately, data encoding is inherent to the hard drive and completely invisible to the system You re never going to have to deal with data encoding, but you ll sure sound smart when talking to other PC techs if you know your RLL from your PRML!
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