TAILIEUCHUNG - Laptops All-in-One Desk Reference For Dummies- P27

Laptops All-in-One Desk Reference For Dummies- P27: Okay, I’ll admit it: I’ve got a strange biography. I’ve been a writer all my life. My first semi-pro job was sports editor of my high school newspaper. (Go Commodores!) After college I was a political reporter for daily newspapers in Ohio and New York (I covered four national nominating conventions and two Presidential campaigns) and a correspondent for The Associated Press. And then, in 1983, I gave in to my inner geek and became the first Executive Editor of PC Magazine, back in the days when most people asked, “What is a PC?”. | 234 Managing Your Disk Drives Defragmentation mechanics For years I ve made a nearly handsome living describing how computers are very dumb but very fast. By that I mean that they accomplish their wondrous feats not so much by innate intelligence but instead by brute force and blazing speed. To multiply 7 845 by 12 687 the machine adds 7 845 to itself 12 687 times. The same applies when it comes to defragmenting a hard disk. There is no magical algorithm or instant solution. Instead defragging works like this The machine locates a block of unused space on the hard disk. The bigger the space the faster the defragmentation process will proceed. Under control of the microprocessor the system picks up the scattered pieces of files one by one and copies them from their former location to the unused space. As the files are rewritten they are compacted and made contiguous to each other. Once all the pieces of a file have been moved to a new location the former location is cleared. As large contiguous blocks of space are opened near the beginning of the disk the rewritten files are copied again and moved to the most efficient location available. The process repeats itself over and over until the disk is as close as possible to this a clean group of contiguous data and program files at the logical start of the disk a block of clean available workspace for the temporary needs of the microprocessor and a block of open space for new files and for the creation of new fragments as old files are edited. If just a few files are fragmented in this way it s no big deal. Or if the particular set of files that are fragmented are ones that you use a great deal it becomes more of a problem. And fragmentation can become a real detriment to computing if you regularly deal with very large files digital photographs streaming video and music are good examples. But one thing is certain Left to its own every computer will eventually slow down and lose available storage space because of .

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