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Main memory, sometimes called random access memory (RAM), is another measure of the goodness of a computer today. RAM is the segment of memory in a computer used for execution space and as a place to store operating system, data, and application files that are in current use. RAM is silicon-based, solid-state memory and is extremely fast in terms of access speed. It is, however, volatile: When the PC is turned off, or power is lost, whatever information is stored in RAM disappears. When basic computer skills courses tell students to save often, this is the reason. When a computer user is writing a document in a word 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 512 Megabytes (MB) of RAM. It amazes me to look across my office at my first Mac, which I purchased in 1986. It has a 40 MB hard drive, 640 KB of RAM, and a processor that doesn t run it dribbles. Yet, it runs the same office applications I use today (although much reduced in terms of bells and whistles) and boots in seconds, compared to my current, very powerful XP machine.
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Secondary memory has become a very popular line of business in the evolving PC market. It provides a mechanism for 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 5-4, which chose a hot July day to fail, right in the middle of writing this book (and yes, I had backed up 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 5-5 is a schematic diagram that more clearly illustrates a bit more how hard drives actually work. The platters, typically made of aluminum and cast to extremely exacting standards, are coated with iron oxide
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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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identical to what is found on recording tape. Adjacent to the platters, which are 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 and transports the information to the disk controller, which in turn, under the guidance of the operating system, transmits the information to the write heads; they, 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. 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 In order to keep track of where files are stored on a disk, whether 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, or 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.
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