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When the operating system formats a disk, it logically divides the disk into what are called cylinders, tracks, and sectors, as shown in Figure 4-6. It then uses those delimiters as a way to store and recall files on a drive using three dimensions. When the operating system (OS) writes the file to the disk surface, every possibility exists (in fact it is likely) that the file will not be written to the surface in a contiguous stream of bits. Instead, the file may be broken into pieces, each of which may be written on a different part of the disk array. The pieces are linked together by the operating system using a series of pointers, which tell the OS where to go to get the next piece of the file when the time comes to retrieve it. The pointer, of course, is a cylinder: track: sector indication. Cylinders, tracks, and sectors are relatively easy to understand. A track is a single writeable path on one platter of the disk array. A cylinder is a stack of tracks on multiple platters, and a sector is a pie slice of the disk array. With a little imagination, it is easy to see how a file can be stored or located on a disk by tracking those three indicators. It should also be easy to see now how some of those wonderful applications like Norton Utilities work. When you direct your computer to erase a file, it doesn t really erase it; it just removes the pointers so that it is no longer a registered file and can no longer be found on the hard drive. What file restore utilities do is remember where the pointers were when you told the computer to erase the file. That way, when you beg the computer to find the file after you ve done something stupid (this is where many people kill the chicken and light candles), the utility has a trivial task: simply restore the pointers. As long as there hasn t been too
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Figure 4-6 Cylinders, tracks, and sectors on a typical disk.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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much disk activity since the deletion and the file hasn t been overwritten, it can be recovered. Another useful tool is the disk optimization utility. It keeps track of the files and applications that you, the user, access most often while also keeping track of the degree of fragmentation that the files stored on the disk are experiencing. Think about it: when disks start to get full, there is less of a chance that the OS will find a single contiguous piece of writeable disk space and will therefore have to fragment the file before writing it to the disk. Disk optimization utilities perform two tasks. First, they rearrange files on the disk surface so that those accessed most frequently are written to new locations close to the spindle, which spins faster than the outer edge of the disk and are therefore accessible more quickly. Second, they rearrange the file segments and attempt to reassemble files or at least move them closer to each other so that they can be more efficiently managed. Okay, enough about hard drive anatomy. Other forms of secondary memory include those mentioned earlier: writeable CDs, Zip disks, floppies, and nonvolatile memory arrays. As I mentioned, this has become a big business because these products make it relatively easy for users to back up files and keep their systems running efficiently.
Input/Output (I/O) Devices
I/O devices are those that provide an interface between the user and the computer and include mice, keyboards, monitors, printers, scanners, modems, speakers, and any other devices that take data into or spit data out of the computer.
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