116 Macintosh
User's
Handbook
Let's try another experiment with the Alternate disk. Try
to
drag its icon to the Trash icon. When the mouse
is
released,
the icon outline will return
to
the disk icon. No disk presently in
a disk drive may be discarded.
Now that
we
have finished with the
data
disk, eject it. Now
try dragging the disk's icon
to
the Trash. The icon disappears.
Open the Trash icon and you will see
that
the Alternate disk's
icon does not appear there.
The
subject disk has been banished
from the kingdom
and
can only return if it
is
reinserted into the
disk drive. The portion
of
the Mac's
RAM
which enables it
to
recognize the Alternate disk has been erased.
In
effect, the Mac
has forgotten
about
the disk.
Insert the disk into the Mac's disk drive. This disk should
be a startup disk like the System disk,
and
it should feature the
applications which
we
will need for operation. For
our
demon-
stration, insure
that
both
the System and this latest disk con-
tain the MacWrite application. The disk icon appears in the
position immediately below the System disk.
This disk has the capacity
to
overthrow the king
and
occupy the Controlling Slot. For now, however, it acts as did
the previous subject disk.
You can erase the system information
on
the disk if you want. Such
an
attempt will cause the Mac
to
display a box asking you if you really want
to
delete system
information. Selecting
0 K in this box will allow the action.
Do
not
do
so at this time.
There are two ways in which the System disk may be
overthrown by another qualified disk. To demonstrate the first
method, open the MacWrite icon residing in the newest disk.
Any Mac application would serve
our
purposes in this
instance. We will not operate MacWrite
at
this time, so do not
be concerned as
to
its functions. When the MacWrite docu-
ment has appeared, select
Quit
from the File menu. When the
Desktop reappears, the second disk will now occupy the Con-
trolling Slot,
and
the first disk will
not
appear. In effect, the
newer disk has overthrown the older one and assumed the
throne. The old king has been banished.
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