Who has access to the logs? Are you the administrator of the server?

Are you 100% certain that there are no other directories on the root of the E: drive? What about any files on the root of E:? Is view hidden files and folders turned on under the view menu? Also, try unchecking "Hide protected operating system files" from the view menu as well, then open E:, select all, right-click and then properties, what does it show for total size used??