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processor, or populating a spreadsheet, or manipulating a digital photograph, the file lives in RAM until the person saves, at which time it is written to Main memory, which is nonvolatile, as we ll see in a moment. Modern systems typically have a minimum of 128 Megabytes (MB) of RAM.
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Secondary memory has become a very popular line of business in the evolving PC market. It provides a mechanism for the long-term storage of data files and is nonvolatile; when the power goes away, the information it stores does not. Secondary memory tends to be a much slower medium in terms of access time than Main memory because it is usually mechanical in nature, whereas Main memory is solid-state. Consider, for example, the hard drive shown in Figure 4-4, which chose a hot July day to fail, right in the middle of writing this book (and yes, I had backed up saved often). That s why the disk platters are exposed. Notice that the drive comprises three platters and an armature upon which are mounted read/write heads similar to those used in cassette decks of yore. Figure 4-5 is a schematic diagram that more clearly illustrates how hard drives actually work. The platters, typically made of aluminum and cast to extremely exacting standards, are coated with iron oxide identical to that found on recording tape. Adjacent to the platters, which are
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Figure 4-4 Close-up of a hard drive, showing platters and read-write head armature.
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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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Figure 4-5 Schematic diagram of a hard drive. As the platters spin, the readwrite heads access the magnetized surfaces of each platter, reading and writing information
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mounted on a spindle attached to a high-speed motor, is an armature upon which is mounted a stack of read-write heads that write information to the disk surfaces and read information from the disk surfaces. Remember when we were discussing the importance of saving often when working on a computer The save process reads information stored temporarily in RAM, transports the information to the disk controller, which in turn, under the guidance of the operating system, transmits the information to the write heads, which in turn write the bits to the disk surface by magnetizing the iron oxide surface. Of course, once the bits have been written to the disk, it s important to keep track of where the information is stored on the disk. This is a function of the operating system (OS). Have you ever inserted a floppy into a drive or (far less fun) a new hard drive into a computer, as I recently had to do, and had the computer ask you if you re sure you want it to format the drive To keep track of where files are stored on a disk, whether it is a hard drive, a CD, a Zip drive, or a floppy, the operating system marks the disk with a collection of road markers that help it find the beginning of the disk so that it can use that as a reference. Obviously, there is no beginning on a circle by design. By creating an arbitrary start point, however, the operating system can then find the files it stores on the drive. This start point is called the File Allocation Table (FAT). If the FAT goes away for some reason, the operating system will not be able to find files stored on the drive. When my hard drive failed, my initial indication that something bad was about to happen was an ominous message that appeared during the boot cycle that said UNABLE TO FIND FAT TABLE.
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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