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What is disk defragmentation ?
In using a computer data/files/bits of info. are placed on the hard drive in random fashion. (fragmentation). This causes the computer to work more & slows it down when retrieving this info. Periodicaly the HD should be defragmented. Meaning everything on it is rearranged, organized, & grouped together. Then, it runs faster & more smoothly when retrieving the info.
idk but it makes my computer better n faster everytime i do it to mine