Apple IIe Card - Manual (Page 18)

Before you do anything else, you should lock the two disks that came
with the Apple IIe Card: the
IIe Installer Disk and the IIe Startup Disk.
Locking disks prevents you from accidentally changing or erasing
the files.
To lock a disk, slide the plastic tab on the back of the disk. When you
can see through the hole, the disk is locked.
This section helps you decide whether you should store your Apple IIe
files on a hard disk or keep them on 3.5-inch and 5.25-inch floppy disks.
If you decide to store Apple IIe files on your hard disk, this section also
tells you how to prepare the hard disk so it can store both Macintosh
and Apple IIe files.
If you don’t have a hard disk, you can go immediately to the next main
section, “Connecting Apple IIe Disk Drives.”
Using a hard disk to
store Apple IIe files
Unlocked Locked
Protecting the disks
Chapter 1: Preparing the Equipment 2