Working on a friends computer. Older IBM P3. Can read from the floppy drive, but can not save to it. Nor can I format a floppy when it is in the drive. I get a message that the floppy is write protected, but it is not. I tried another floppy drive unit and another cable, but still get the same message when trying to save or format a floppy--The disc is write protected etc. ??? any suggestions ??