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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. See
the Macintosh Reference for information.
m The disk might be damaged. See the Macintosh Reference for information
on testing and repairing disks.
If you are trying to use a DOS disk:
m The disk may have been formatted incorrectly on a DOS computer. On
DOS computers it’s possible to format a standard double-sided disk in a
high-density (1440K) format, and vice versa. Disks formatted this way
cannot be read by a Macintosh computer.
When formatting disks on a DOS computer, always format standard
double-sided disks in the 720K format. Always format high-density disks
in the 1440K format.
If a disk has been formatted incorrectly, use a DOS computer to copy its
contents onto another disk that has been properly formatted.
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Solutions to Common Problems