Clustered Index internal structure

Question

Will a clustered index in SQL Server 2008 R2 create an additional B-tree structure like in case of nonclustered index, where each element of the B-tree contains value and data locator?

Or SQL server just sorts all the table by the clustered index column?

Answer 1

Clustered Index by definition is the data and is stored with the index on disk in the order of the index itself. Instead of pointers to the data, the actual data is part of the index node.

http://msdn.microsoft.com/en-us/library/ms177443(v=sql.105).aspx