If you have multiple deployment shares set up on your network using MDT 2010, is it possible to choose which one to use from the target computer at the beginning of a deployment?
Yes. Simply remove the DeployRoot line from the bootstrap.ini file of each of your deployment shares, and then update your deployment shares to regenerate the boot images. Now, when a target computer is started from a boot image, a dialog will be displayed asking you to type the UNC path to the deployment share you want to use. Alternatively, you can manually create a LocationServer.xml file that MDT can use to display a drop-down list of deployment shares on the target computer. For more information on LocationServer.xml file, see the topic titled "Selecting a Local Microsoft Deployment Toolkit Server When Multiple Servers Exist" in the MDT Documentation Library, which is installed as part of MDT 2010.