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25 Why can't my Quadra (SE/30, IICI, etc.) read the disks from my Plus? (Macintosh hardware)




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This article is from the Macintosh hardware FAQ, by Elliotte Rusty Harold elharo@shock.njit.edu with numerous contributions by others.

25 Why can't my Quadra (SE/30, IICI, etc.) read the disks from my Plus? (Macintosh hardware)

The Macintosh Plus and earlier machines along with original Mac II's
and some SE's do not have the high density FDHD drive necessary
to properly read and format high-density disks. If you insert a
blank high-density disk in a low density drive, the Mac, not knowing
the difference between a double-density and a high-density floppy,
will happily format your expensive 1.4 meg disk as a cheap 800K
diskette. When you move this disk to a more advanced machine
with a FDHD drive, the newer drive will recognize the disk as a
high-density floppy by its extra hole. Since the disk has been
formatted as 800K instead of as 1400K, the FDHD drive will try to
read it as a 1400K disk and fail. Then it will ask if you want to
initialize it. As a temporary work around place a small piece of
tape over both sides of the extra hole on the high-density disk to
trick the Mac into treating the disk as double-density. This is a
temporary fix only, and the tape should be removed and the disk
reformatted to the proper size as soon as possible.

 

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