Add a disk to an HyperV Cluster

First detect the disk

Windows Administrative tools
 --> Computer Management
  --> Storage
   --> Disk Management (right click on **Rescan Disks**)

A new disk is detected and is in Unknown state

Disk Management
 --> Right click on it and bring it **online**
  --> Right click again **Initialize Disk**
   --> choose **GPT**
    --> Right click **New Simple Volume**
     --> Do not assign a drive letter and validate (if win 2012R2 or later then you can use ReFS)

Now you can add the new volume into the HyperV Cluster

Failover Cluster Manager
 --> Storage
  --> Disk
   --> On the right pane, **Add disk**
    --> Disk is now visible on the middle pane, as **Available Storage**
     --> Optional: right click on it and into Properties, change the disk name
     --> Right click on it and **Add to Cluster Shared Volumes**, now status change to **Clustered Shared Volume**

Now the new storage is visible into explorer in C:\ClusterStorage\