On a Cincinnati with 840D:

We didn´t used the floppy disk for a while and last time we used it a year ago it performed well.
Lately I've been trying to backup programs and everything is actually working fine, I can even see the writing progress of the programs on the floppy but once I m done and I try to read the floppy on my laptop or on the machine control it appear that there is nothing on it...

I wonder if I need to give a special format to the floppy or what I'm missing.
I replaced the floppy unit by another one and it perform exactly the same.

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