Defragmentation
From TheLinuxVault
Defragmentation is required periodically on Windows filesystems, such as FAT or NTFS, because those filesystems clump the files together so that fragmentation develops. Linux filesystems, such as ext3, reiserfs, or xfs, do not require defragmentation because those filesystems space the files out so that fragmentation does not often develop. Fragmentation can develop on a Linux filesystem when it is almost completely full, but it is not possible to defragment a filesystem that is almost completely full.
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