How to fix a fragmented ext disk - myth or truth?

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http://unix.stackexchange.com – I just read this article about the virtually non-existent disk fragmentation on *nix filesystems. It was mentioned that due to the way ext handles writing data to the disks, fragmentation may only begin manifesting on hard drives that are at least 80%, where the free space between the files starts to run out. On how to deal with this fragmentation, the final paragraph reads: If you actually need to defragment a file system, the simplest way is probably the most reliable: Copy all the files off the partition, erase the files from the partition, then copy the files back onto the partition. T (HowTos)