If you cared about not erasing the drive manufacture's data on sealed media Winchester and the like you have to avoid any writes to cylinder 0 at all.
On a floppy?
It might not be relevant HERE, but SOME computers have a different physical format on track 0 (such as systems that evolved from FM to MFM and continued to have track 0 be single density) Writing to track 0 could be hazardous to whatever is s'posed to be on track 0.
