When you restart a computer that is running Windows MultiPoint Server (WMS) 2011, an external USB storage device may be assigned a different drive letter.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 2569537 - Last Review: Aug 8, 2011 - Revision: 1