External storage technical information.

Bug: 7384941
Change-Id: I7e788415048122e5fda7c7fffaafcec23c01b938
diff --git a/src/tech/index.md b/src/tech/index.md
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--- a/src/tech/index.md
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@@ -67,4 +67,10 @@
 
 [» Data Usage Information](/tech/datausage/index.html)
 
+## External Storage Technical Information
 
+Android supports devices with external storage, typically provided by physical
+media or an emulation layer.  This document is designed to help systems
+integrators configure Android devices.
+
+[» External Storage Technical Information](/tech/storage/index.html)