Apple Power Macintosh 7600/200 Series - Manual (Page 167)

After inserting a floppy disk, you see the message, “This is not a Macintosh disk: Do you
want to initialize it?" or "This disk is damaged: Do you want to initialize it?"
m The floppy disk may be new and not yet initialized. If you’re sure the disk
has never been used, click Yes.
m The disk may have been formatted for use on DOS/Windows systems, or
some other kind of computer. If so, see the tips that follow.
m Click No in the dialog box asking you if you want to initialize the disk.
m Make sure the PC Exchange control panel is in the Control Panels folder
(in the Apple [K] menu) and that it is turned on. Also, make sure PC
Exchange is enabled in the Extensions Manager control panel. For more
information about Extensions Manager, see the information about
managing extensions in Macintosh Guide (or Mac OS Guide), available
in the Guide (h) menu.
m When formatting floppy disks on a DOS computer for use in a
Macintosh, you need to format standard double-sided disks as 720K
disks and high-density disks as 1440K disks. Double-sided disks
formatted in 1440K format and high-density disks formatted in 720K
format may not work in a Macintosh.
If you think your DOS floppy disk might have a format that doesn’t
work in a Macintosh, use a DOS computer to copy the contents of the
disk onto a properly formatted disk.
m The floppy disk may be too warm or too cold to be read. You can warm up
a cold disk safely by setting it on top of your monitor for a few minutes.
You can cool an overly warm disk by placing it in a shady, cool place.
WARNING Clicking Yes erases all data that may be on the disk.
Therefore, only click Yes if you’re sure the disk contains no important
data. If you’re not sure, click No.
167 Solutions to Common Problems