In DPM Administrator Console, click [Management] on the navigation bar, and then click the [Disks] tab.
Select the disk that you want to be removed, and in the [Actions] pane, click [Remove].
In order to create the Storage Pool in the DPM you can use the following three types of Disk Storages,
Direct attached storage (DAS)
Storage area networks (SAN)
Windows-certified iSCSI devices
Note: It is possible to add RAID volumes to your storage pool, but some common RAID configurations, such as RAID 5, are less suitable for use with DPM [...]