The disk security feature of At Ease, "prevent users from starting up with a floppy" does not work on HFS+ formatted hard drives. The option to select this feature in the At Ease admin program can still be checked, but a user can use an Mac OS 8.1 CD/floppy to start up an HFS+ formatted drive thus bypassing security.
Only a Mac OS 8.1 bootable CD/floppy could be used to start up the workstation with the HFS+ drive since earlier versions of the Mac OS do not recognize HFS+ drives.