My external drive on F: is a Seagate Goflex. A list of folders contain my backups but when I right click on a folder the drop down window does not contain "New" so I can not create subfolders. But when I right click on an empty space, the drop down window has New and I can create and rename new folders but only in the 1st level. What is the hierarchy on the drive, just one level of folders? On the main HD a tree can be developed, not on the external drive? Please advise, thank you Windows 7 Pro.