I received an email a couple of days ago requesting a blog about MDT 2012 and WDS. This is the way you should go if you are using MDT 2012. If you are dealing with multiple machines on your network that needs to be wiped and imaged Windows Deployment Services is the key item to accomplish this.
The demonstration setup is straight forward. I have one domain controller and one Windows Server 2008 R2 machine which will be the MDT server and the WDS server. Here are some links with MDT and WDS information:
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