Well the lisa auction states: "Speaking of which, I'm including a full set of fresh, never-used DUPLICATE 400k Lisa 7/7 disks, as well. These replicas look very much lke the authentic Lisa disks, except they are less yellowed, the label art is not quite as crisp, and the write-protect tabs are black instead of red. But they may prove useful if you ever need to re-install." If you look in the photo gallery where he shows the images of the "duplicate" disks, you'll see the back sides have the high density indentation ready for punch out.