We are using physical disk on two of Guest operating systems. Is this a know issue? Do we need to have DPM 2010? "One or more physical disks are attached to virtual machine 'Myserver'. Back up programs that use the Hyper-V VSS writer cannot back up volumes that are attached to virtual machines as physical disks. To avoid potential data loss, use another method to back up the data on the physical disks. If you restore the data on this virtual machine, make sure to check the data of the physical disk for integrity. (Virtual machine ID 8EF3C0CB-967D-4D67-B4D8-7B782C7AC07C)"