Failover Cluster: No disks suitable for cluster disks were found

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http://serverfault.com – I am trying to setup a failover cluster with two nodes. After running the validation tests, the storage sections had many warnings. The next step after creating the cluster with two nodes on the same domain is to add storage. I right click on storage and choose "add a disk", then I get the following error: No disks suitable for cluster disks were found. For diagnostic information about disks available to the cluster, use the Validate a Configuration Wizard to run Storage tests. I have already ran the tests, what can I do to continue the steps of creating a failover cluster? (HowTos)