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+.. _Increase UOS disk size:
+
+Increasing the User OS disk size
+################################
+
+This document builds on the :ref:`getting_started` and assumes you already have
+a system with ACRN installed and running correctly. The size of the pre-built
+Clear Linux User OS (UOS) virtual disk is typically only 8GB and this may not be
+sufficient for some applications. This guide explains a simple few steps to
+increase the size of that virtual disk.
+
+This document is largely inspired from Clear Linux's `Increase virtual disk size
+of a Clear Linux* OS image <https://clearlinux.org/documentation/clear-linux/
+guides/maintenance/increase-virtual-disk-size>`_ tutorial. The process can be
+broken down into three steps:
+
+1. Increase the virtual disk (``uos.img``) size
+#. Resize the ``rootfs`` partition
+#. Resize the filesystem
+
+Increase the virtual disk size
+******************************
+
+.. note::
+
+   This step **must** be performed while the User OS (UOS) is powered off.
+
+We will use the ``qemu-img`` tool to increase the size of the virtual disk
+(``uos.img``) file. On a Clear Linux system, you can install this tool using:
+
+.. code-block:: none
+
+   $ sudo swupd bundle-add clr-installer
+
+As an example, let us add 10GB of storage to our virtual disk image called      
+``uos.img``.
+
+.. code-block:: none
+
+   $ qemu-img resize -f raw uos.img +10G
+
+.. note::
+
+   Replace ``uos.img`` by the actual name of your virtual disk file if you
+   deviated from the :ref:`getting_started`.
+
+.. note::
+
+   You can choose any increment for the additional storage space. Check the
+   ``qemu-img resize`` help for more information.
+
+Now that you have increased the size of the virtual disk, power up the Virtual
+Machine (VM) before moving to the next steps.
+
+Resize the ``rootfs`` partition
+*******************************
+
+Follow the `Resize the partition of the virtual disk <https://clearlinux.org/
+documentation/clear-linux/guides/maintenance/increase-virtual-disk-size#resize-
+the-partition-of-the-virtual-disk>`_ section to resize the partition hosting the
+UOS rootfs (typically ``/dev/sda3``).
+
+Resize the filesystem
+*********************
+
+Follow the `Resize the filesystem <https://clearlinux.org/documentation/
+clear-linux/guides/maintenance/increase-virtual-disk-size#resize-the-filesytem>`_
+section to resize the filesystem to use the entire storage capacity.
+
+Congratulations! You have successfully resized the disk, partition, and
+filesystem or your User OS.