Symptoms

1. You create a master image of a UEFI machine

2. You start to deploy this image to the same machine via a deployment task from OS Deploy Server

3. OS Deploy Server logs contain the following error:

Internal error: write outside of allowed area

Cause

Issue in the product

Solution

This issue was fixed in Update 4 (Build 1877), please update to the latest build. 

To work around the issue without installing the latest build, perform Standalone deployment instead of deployment with OS Deploy Server: see product documentation for instructions