Wbadmin get disks
Applies To: Windows Server 2008, Windows Server 2008 R2, Windows Server 2012 R2, Windows Server 2012, Windows 8
Lists the internal and external disks that are currently online for the local computer.
To list the disks that are online with this subcommand, you must be a member of the Backup Operators group or the Administrators group, or you must have been delegated the appropriate permissions. In addition, you must run wbadmin from an elevated command prompt. (To open an elevated command prompt right-click Command Prompt, and then click Run as administrator.)
wbadmin get disks
This subcommand has no parameters.