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Chapter 8 - Chapter 8 Data Security and Control Kinds of...

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Chapter 8 Data Security and Control Kinds of things that can go wrong: Lost data or missing data - data that somehow disappears from your disk. Stolen data - data copied or retrieved from your disk without your approval inaccurate data - data entered incaccurately or accidentaly altered Sources of Errrors: Operator Error Main symptom " The computer ate my term paper" 1. Exiting a word processor without saving the document you have created or altered. Usually dialog boxes will pop up that ask you whether you want to save your work. You can mistakenly answer no, and the document will be lost. 2. Inadvertently deleting or erasing a file. Some modern operating systems will pop up a window that asks you if you're sure you want to delete "filename" before honoring a deletion request. In a command line operating system, you type delete filename to erase a file. If you are in a subdirectory, you no longer need, you type delete *.* to delete all files in that subdirectory. If you think you are in a subdirectory and are instead at the root directory of drive C, typing delete *.* will erase all files on your hard disk. Similarly, you make think you are in disk A (a floppy you no longer need) and type dir *.* and instead you may still be in drive C (the hard disk). Before using this deletion command, you should always use the command >dir *.* which lists all files in your current subdirectory. Then you can decide if these are the files you want to delete. 3. Formatting a floppy disk (or hard disk) that contains data you need. Formatting a disk erases it. If you are formatting a floppy, try to open the disk and see what is in it before formatting unless it is a brand new disk. 4. Overwriting an old file with a new one. You can also erase a file by saving a new file using the same name as the older file. The new file will overwrite the old one, causing its data to be lost. The operating system will ask you if you want to replace the current file with the new one. DOS did not do this, it
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just overwrote the old file. 3. Another operator error which causes inaccurate data is just typing in the wrong data. Many people have the title "data entry operator" whihc means they sit at a keyboard all day and type in data. Newer direct source input devices -- scanners, bar-code readers, are available that collect the data from a document or source without the need for retyping. Of course, the data on the document could also be incorrect. Power and equipment failures. Many ways to lose power: Turning computer power switch off by accident or by removing the power cord from its outlet (I can verify that if you drop a book off your desk and it hits your power cord where it meets the wall, you will lose power). Of course, you can experience a power outage by more conventional means - electrical storm causing power outage or power brownout due to heavier than normal electrical use.
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