Date   : Thu, 08 Mar 1984 00:41:00 cst
From   : Eaton.HFED@AMSAA.ARPA
Subject: re: disk editor for cpm/1791

DUU and DU2 (with more features) are indeed excellent disk editors.
There is however one slight problem when dealing with disks with bad
sectors.  My BIOS and I assume most BIOS' trap errors and will not
return the data to DUU or DU2 if one is detected.  This leaves the
contents of the previous read in DUU's buffer.  I wrote quick and
dirty DDT routines to turn off error detection while attemting to
repair bad sectors  and then reenable error detection when I'm done.

NEVER!  "That's NEVER EVER try fixing a bad track by doing:
read..  write.. increment.. loop.    Fix those nasty little sectors
one at a time "manually".  I completeletely destroyed a directory by
doing the afforementioned "never ever".

The error handling/reporting by those programs "should" abort loops and
return error messages to the user.

Jesse (who knows more than one way to destroy a disk)