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+= User Partition
+:page-parent: Development
+:page-nav_order: 5
+
+// SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
+// SPDX-License-Identifier: GFDL-1.3-no-invariants-or-later OR CC-BY-SA-4.0
+
+The Spectrum host system is immutable, so configuration and user data
+lives on a separate partition.
+
+The host system discovers the user
+partition by looking for the special partition type
+`9293e1ff-cee4-4658-88be-898ec863944f`.
+
+This behavior can be overridden with the `ext` parameter on the host's kernel
+command line, which works in a similar way to the standard Linux `root`
+parameter.