There are 2 things to check. First I think the view has to be set to medium icon or larger. Second under Tools>Folder Options>View tab the first check box says "always show icons, never thumbnails". Make sure it is un-checked (no check mark).
But I don't understand why I can only see the pictures by thumd mode in local disk but in extend hard disk I can not see it by thumd mode,
although the settings of windows is default.