When a vDisk is no longer needed, it can be retired. Retire a vDisk by deleting it. When a vDisk is deleted, all VHD differencing disk files, properties files, lock files, and difference cache are also deleted.
Note: You cannot delete a vDisk if one or more target devices are currently assigned to it. Unassign all target devices from the vDisk, before attempting to delete it. If deleting a personal vDisk, a confirmation dialog appears to warn you that you will be deleting the vDisk reference files as well as the the device it is assigned to.