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mke2fs is used to create a filesystem. It "erases" everything on the target partition and creates a new, fresh, file system on it.
tune2fs is used to tune (daahh) parameters on a already created file system. Things like volume name, max time between checks, etc. It don't create anything, just adjust parameters that was set by a previous run of mke2fs.
Both operations must be done on un-mounted partitions.
You can create a new filesystem (what you call "format") only on un-mounted partitions, after all, you are creating the data that will be used to mount it later !
Thanks for your reply. Got the thing about mke2fs . But what about tune2fs ?
tune2fs is used to tune (daahh) parameters on a already created file system as you said. So is tune2fs safe enough to be performed even on a mounted partition ?
So is tune2fs safe enough to be performed even on a mounted partition ?
No! Theses parameters controls how the filesystem is mounted, checked, if it has a journal or not, how much space is reserved to the superuser, and changing this on-the-fly could result in unexpected behavior and corrupted data being write to the disk.