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Your Macintosh can’t read a floppy disk.
If you see a message that a floppy disk is unreadable, try one of the following:
m If the disk has never been used, you may simply need to initialize it. For
instructions, see the “Disks” topic of Macintosh Guide, available in the
Guide (h) menu.
m The disk may be damaged. See “Repairing a Damaged Disk” later in this
chapter for information on testing and repairing disks.
m If the disk is a high-density disk previously used on another computer, the
disk may have been formatted incorrectly as an 800K disk rather than as a
1440K (high-density) disk. If so, use the other computer to copy the disk’s
contents onto a properly formatted disk.
If you are trying to use a DOS disk, consider the following:
m When formatting disks on a DOS computer for use in a Macintosh, users
need to format standard double-sided disks as 720K disks and high-density
disks as 1440K disks. Because DOS computers allow standard double-
sided disks to be formatted in 1440K format and high-density disks to be
formatted in 720K format, it’s possible that your disk has been given a
format that won’t 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 your DOS
floppy disk onto another DOS floppy disk that has been properly formatted
for use in a Macintosh.
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Troubleshooting