code: def GetRawDevice(path):
    
    device_map = GetMountpoints()
  
    path = utils.SmartUnicode(path)
    mount_point = path = utils.NormalizePath(path, "/")
  
    result = rdf_paths.PathSpec(pathtype=rdf_paths.PathSpec.PathType.OS)
  
    # Assign the most specific mount point to the result
    while mount_point:
      try:
        result.path, fs_type = device_map[mount_point]
        if fs_type in [
            "ext2", "ext3", "ext4", "vfat", "ntfs", "Apple_HFS", "hfs", "msdos"
        ]:
          # These are read filesystems
          result.pathtype = rdf_paths.PathSpec.PathType.OS
        else:
          result.pathtype = rdf_paths.PathSpec.PathType.UNSET
  
        # Drop the mount point
        path = utils.NormalizePath(path[len(mount_point):])
  
        return result, path
      except KeyError:
        mount_point = os.path.dirname(mount_point)
docs: Resolve the raw device that contains the path.