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# IRC, freenode, #hurd, 2012-04-20
<Tekk_> what are the extensions to ext2?
<Tekk_> that hurd uses
<braunr> tha ability to store passive translator command lines in the
inodes
<braunr> the*
<antrik> well, also a fourth set of permission bits, and an "author" field
<braunr> right
<antrik> both very obscure features that better never existed...
The fourth set of permission bits is for unknown users.
In order to take advantage of these features, the owner/creator of the
partition must be set to *hurd*. `mke2fs`, unless specifically overridden on
the command line (`-o hurd`, for example), will set the default to whatever
system it is running on. At least the root filesystem must be of *hurd* type,
as it has to store various passive translator settings. Even if a file system
is not of the native type, others may still use it; they just may not be able
to use certain extensions.
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