I'm also having this problem of my external drive not showing any folders. Also, it used to be called "Hitachi" and now it is simply "Local Disk (E:)"
The one thing I did was early today disconnect the USB cable for a period of time. When I reconnect it I hear the drive come on, and "disk properties" shows the usual amount of space used/free.
When I try the above suggestion using command prompt I get the following message:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Chuaz>attrib -h -r -s /s /d e:\*.*
Unable to change attribute - E:\'Ç?
C:\Documents and Settings\Chuaz>