Can you elaborate a bit more about what your talking about?

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If you are talking about the difference between hi-capacity and lo-capacity 3 1/2 inch floppy disks then the answer is there is a PHYSICAL limitaion on the older disks of 700K.

You can poke a hole in it, but it will gain you nothing. (It seems to me there even was a device to do this… but I am getting old and my memory isn’t what it once was.)

Steve