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For production systems, shared storage must be shared at os level: typically this is done with external storage systems like SAN where LUNs are made available on each cluster node. For example if you use OFCS on Windows all related file systems need to be available in read write mode on all cluster nodes.
For demo systems, it it possible to use virtual machines for nodes and virtual disks for shared storage: you can find full installation examples on ORACLE-BASE with Windows and VirtualBox or VMWare: http://www.oracle-base.com/articles/rac/articles-rac.php.