The cluster setup fails without a clear error message when you install a SQL Server 2008 failover cluster and you select a drive that does not have a drive letter assigned
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Source: Knowledge Base
Product: Microsoft SQL Server 2008 Enterprise
Notification Contents: New and Major Modifications
The cluster setup fails without a clear error message when you install a SQL Server 2008 failover cluster and you select a drive that does not have a drive letter assigned
http://support.microsoft.com/kb/955722/en-US