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file system fragmentation defragmentation linux ––>Re: Defrag in linux? - Newbie question

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In a single-user, single-tasking OS, it's best to keep all blocks for a file together, because _most_ of the disk accesses over a given period of time will be against a single file. In this scenario, the read-write heads of your HD advance sequentially through the hard disk. In the same sort of system, if your file is fragmented, the read-write heads jump all over the place, adding seek time to the hard disk access time.

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