🚀 go-pugleaf

In article <PEPRBV.870625.215954.A0@CFAAMP.BITNET> PEPRBV@CFAAMP.BITNET (Bob Babcock) writes:
>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.

Well,  we have a program written by an OS9 UG member (actually, a
staffer as  well - Carl Kreider) that wrote something called
HDREAD. It reads a disk a track at a time, and then backs up and
isolates bad sectors if a track has a hit. You can use two companion
utilities with this: a) Hooz - determines who the sector's owner is
(if any), and b) Mapout - which toggles the sector bit in the bitmap.
These may be set up in filter/pipe fashion (i.e. hdread -h ! mapout
-z).

Caveats:

a) I'm not sure that this code is truly PD - I will check.

b) It was written & used under OS9/6809 level II, but since it's
in MW C, it should be trivial to port. Carl has both 6809 and 68000
systems.


-- 
                                                   Pete Lyall

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