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Originally Posted by Martin
As for disc defragmentation. The hard drive is a stack of discs that spins at a few thousand rpms and which a head hovers over for reading and writing. Depending on where on the disc you are accessing, there is a noticeable difference in speed. Add to that, it is quicker to read data sequentially rather than jumping to different sectors of the drive, so that is often how data will be written. Data is moved and removed during the life span of your computer, sectors will become available to be written to again. This results in data on your drive being "fragmented", located in different sectors of the drive. The disc defragmenter moves them to a sequential order and thus makes reading and writing faster.
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You know it's time to run defrag when your computer starts shaking like an old washing machine every time it accesses the hard drive.
--Aric