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+<chapter xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="ch-file-systems">
+ <title>File Systems</title>
+ <para>
+  You can define file systems using the <option>fileSystems</option>
+  configuration option. For instance, the following definition causes NixOS to
+  mount the Ext4 file system on device
+  <filename>/dev/disk/by-label/data</filename> onto the mount point
+  <filename>/data</filename>:
+<programlisting>
+<xref linkend="opt-fileSystems"/>."/data" =
+  { device = "/dev/disk/by-label/data";
+    fsType = "ext4";
+  };
+</programlisting>
+  Mount points are created automatically if they don’t already exist. For
+  <option><link linkend="opt-fileSystems._name__.device">device</link></option>,
+  it’s best to use the topology-independent device aliases in
+  <filename>/dev/disk/by-label</filename> and
+  <filename>/dev/disk/by-uuid</filename>, as these don’t change if the
+  topology changes (e.g. if a disk is moved to another IDE controller).
+ </para>
+ <para>
+  You can usually omit the file system type
+  (<option><link linkend="opt-fileSystems._name__.fsType">fsType</link></option>),
+  since <command>mount</command> can usually detect the type and load the
+  necessary kernel module automatically. However, if the file system is needed
+  at early boot (in the initial ramdisk) and is not <literal>ext2</literal>,
+  <literal>ext3</literal> or <literal>ext4</literal>, then it’s best to
+  specify <option>fsType</option> to ensure that the kernel module is
+  available.
+ </para>
+ <note>
+  <para>
+   System startup will fail if any of the filesystems fails to mount, dropping
+   you to the emergency shell. You can make a mount asynchronous and
+   non-critical by adding
+   <literal><link linkend="opt-fileSystems._name__.options">options</link> = [
+   "nofail" ];</literal>.
+  </para>
+ </note>
+ <xi:include href="luks-file-systems.xml" />
+</chapter>