ManagementClass devs = new ManagementClass(@"Win32_Diskdrive");
            ManagementObjectCollection moc = devs.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                UInt32 physicalDiskNumber = (UInt32)mo["Index"];
                UInt64 diskSize = (UInt64)mo["Size"];
                foreach (ManagementObject b in mo.GetRelated("Win32_DiskPartition"))
                {
                    //b["Name"] gives something like "Disk #0, Partition #0"
                    string[] elems = b["Name"].ToString().Split(',');
                    int partitionNumber = Int32.Parse(elems[1].Replace("Partition #", "").Trim());
                    ulong size = (ulong) b["Size"];

                }
            }