🚀 go-pugleaf

I just  installed  a replacement  hard  disk  in  a Mizar  system
running OS-9/68K.  The manufacturer's  tests show one bad sector,
but this is not detected  by the verify  stage of format,  so the
sector is not locked out.  Mizar's documentation  says to use the
Mizar  badsector  utility  in a case like this, but it turns  out
that  they  haven't  yet  written  this  utility,  and  can  only
recommend  that I run format  repeatedly  in hopes  that  it will
eventually  find the bad spot.  I could easily  see wasting  more
than  a man-day  learning  enough  about  the file structure  and
writing  custom  code to solve this problem,  which means that it
might be cheaper  to buy another  disk.  Has anyone  solved  this
problem already?  Reasonable solutions would be to figure out the
mapping  between head/cylinder  number and OS-9 sector number and
fiddle  with the bit map, or thoroughly  test all the unallocated
disk sectors and leave a read-only file on top of any bad sectors
found.

Thanks for any suggestions.