A possible criticism of this work is that booting from a floppy disk provides the same level of protection. There are several reasons why this is not so. The first is that providing physical security for the floppy disk is extremely difficult. Users can take the disks wherever they like, and do whatever they like to them. One can envision a user building their own boot floppy that gives them system level privileges. The user is now free to read and write anywhere on the local disk circumventing any security systems put in place by the ``real'' boot floppy or the on disk operating system. This problem is described by Microsoft [16] as a method of circumventing the Windows NT file system (NTFS). The major shortcoming, however, in using a boot disk is that none of the firmware is verified prior to use. Thus, a user can add or replace expansion boards into the system without any security controls, potentially introducing unauthorized expansion cards.