Normally I hesitant to show posters how to destroy their systems. In fact I'll let the Hey, Scripting Guy! show you how.
How Can I Delete a Folder and All Its Subfolders.
Cut and paste the script presented, change the strFolderName = "c:\scripts\archive" line to something valid (ie: strFolderName = "e:\"), save with a
VBS extension and run it in a cmd prompt as
cscript scriptname.vbs.
I'm still unclear why you can't simply use a format command but hey! it's your system.
8-)
If you insist on doing this with a batch file, something like this might help: RD e:\*.*