Why RAW partitions are visible only on one node in RAC?

I am having 2 node RAC on Windows 2003 Server.
Can anybody tell me why the RAW partitions are visible on RAC-2 but not on RAC-1.
I Shutted down RAC-2, and I thought all the RAW devices will appear in RAC-1, but it didn't work, it is displaying only LOCAL DRIVE.
Why???

I am using Microsoft Virtual Server and I have configured SCSI type shared disks.
I executed the given command
C:\oracle\product\10.2.0\crs\bin>cluvfy comp ssa -n rac-1,rac-2
Result : Shared storage check was successful on both the nodes..
Both the nodes are working properly but I want to know the reason 'why the shared disks are not visible on node1'?
Thanks
Sushil

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