barcode printing using vb.net The hard drive in Software

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A hard drive, also known as a hard disk, is a common form of mass storage for computer data. The drive consists of several disks, called platters, arranged in a stack. They are made from aluminum or other rigid material, coated with a ferromagnetic substance similar to that used in audio or video tape. The platters are spaced a fraction of an inch apart. Each has two sides (top and bottom) and two read/write heads (one for the top and one for the bottom). The assembly is enclosed in a sealed cabinet. Figure 33-2A is an edgewise, cutaway view of the platters and heads in a typical hard drive.
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When the computer is switched off, the hard drive mechanism locks the heads in a position away from the platters. This prevents damage to the heads and platters if the computer is moved. When the computer is powered up, the platters spin at several thousand revolutions per minute (rpm). The heads hover a few millionths of an inch above and below the platter surfaces. When you type a command or click on an icon telling the computer to read or write data, the hard drive mechanism goes through a series of rapid, complex, and precise movements. The head must be positioned over the particular spot on the platter where
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The hard drive 627 Heads
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33-2 At A, edgewise view of a hard drive, showing four platters. At B, broadside view of a platter, showing one track and one sector.
the data is located or is to be written. Then the head must stabilize its position and generate or detect the magnetic fields. All this takes place in a small fraction of a second.
Data arrangement and capacity
The data on a hard drive is arranged in circular tracks. This is not quite like the spiral groove on an old-fashioned phonograph disk. While that groove is one long path, the tracks on a platter are individual circles. There are hundreds or even thousands of tracks per radial inch of the platter surface. Each circular track is broken into a
628 Computers and the Internet number of arcs called sectors. A cylinder is the set of equal-radius tracks on all the platters in the drive. Tracks and sectors are set up on the hard drive during the initial formatting process. There are also data units called clusters. These are units consisting of one to several sectors, depending on the arrangement of data on the platters. Figure 33-2B is a face-on view of a single hard-disk platter, showing a track and one of its constituent sectors. The average new computer hard-drive data storage capacity roughly doubles every year, and thus increases by about three orders of magnitude per decade. At the end of the year 2000, during the holiday computer-buying season, a new desktop machine had between 10 and 100 GB of hard-drive capacity. By the end of the year 2010, if trends continue, these figures will be approximately 1000 times greater a range of 10 to 100 TB. Do petabyte and exabyte machines mentioned a few paragraphs ago seem out of this world, impossible, or ridiculous Extrapolate. Chances are good that you will live to see them. When you buy a computer, whether it is a desktop, notebook (also called laptop), or portable (also called handheld) unit, it will have a hard drive built in. The drive comes installed and formatted. Most new computers are sold with several commonly used programs preinstalled on the hard drive. Some computer users prefer to buy new computers with only the operating system, by means of which the programs run, installed; this frees up hard-drive space and gives the user control over which programs to install (or not to install).
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