保存在一个以GUID命名的文件夹内。文件夹应该是隐藏的。你可以选择备份这些信息到其他地方，这样即使U盘中的信息被误删，仍然可以使用备份的key来恢复数据。
Backing Up BitLocker and TPM Recovery Information to AD DS
http://technet.microsoft.com/en-us/library/dd875529(WS.10).aspx
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