public static List<string> GetListDisk()
    {
      List<string> lstDisk = new List<string>();
      ManagementClass mgtCls = new ManagementClass("Win32_DiskDrive");
      var disks = mgtCls.GetInstances();
      foreach (ManagementObject mo in disks)
      {
        //if (mo.Properties["InterfaceType"].Value.ToString() != "SCSI" 
        //  && mo.Properties["InterfaceType"].Value.ToString() != "USB"
        //  )
        //  continue;

        if (mo.Properties["MediaType"].Value == null ||
          mo.Properties["MediaType"].Value.ToString() != "External hard disk media")
        {
          continue;
        }

        //foreach (var prop in mo.Properties)
        //{
        //  Console.WriteLine(prop.Name + "\t" + prop.Value);
        //}

        foreach (ManagementObject diskPartition in mo.GetRelated("Win32_DiskPartition"))
        {
          foreach (ManagementBaseObject disk in diskPartition.GetRelated("Win32_LogicalDisk"))
          {
            lstDisk.Add(disk.Properties["Name"].Value.ToString());
          }
        }

        //Console.WriteLine("-------------------------------------------------------------------------------------------");
      }
      return lstDisk;
    }