C# 读取驱动器盘符及信息

System.IO.DriveInfo[] hardDiskDrives = System.IO.DriveInfo.GetDrives();
            foreach (System.IO.DriveInfo hardDiskDrive in hardDiskDrives)
            {
                if(hardDiskDrive.DriveType.ToString() != "CDRom")
                {
                    totalSize = hardDiskDrive.TotalSize / (1024 * 1024 * 1024);
                    totalFreeSpace = hardDiskDrive.TotalFreeSpace / (1024 * 1024 * 1024);
                    textBoxDisksVolumn.Text += hardDiskDrive.Name + " " + totalSize.ToString() + "GB   ";
                    textBoxAvalaibleSpace.Text += hardDiskDrive.Name + " " + totalFreeSpace.ToString() + "GB   ";
                } 
            }