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Path: utzoo!watmath!clyde!floyd!harpo!seismo!hao!hplabs!sri-unix!George.Wood@cmu-cs-a
From: George.Wood%cmu-cs-a@sri-unix.UUCP
Newsgroups: net.micro.cpm
Subject: RE: disk editor wanted for cpm/1791
Message-ID: <17004@sri-arpa.UUCP>
Date: Tue, 28-Feb-84 23:50:00 EST
Article-I.D.: sri-arpa.17004
Posted: Tue Feb 28 23:50:00 1984
Date-Received: Sat, 3-Mar-84 00:15:07 EST
Lines: 15


Ward Christiansen's DUU (DU version 77 ?)  is a good disk editor, but
will not do exactly what Bob Meier wants, i.e.  read a bad sector, if
the sector crc is bad; This is bacause the 179x series won't do the
read -- it reports the crc error instead.  If the sector is damaged but 
contains a valid crc, or is intermitently readable DUU will read it.

	The only way I know of to read really bad sectors is to read
the whole track and pick the sector out of the track.  I don't know of
any editor which will do this, although I have a little program which
will read a track into a buffer and let me mess with it via ddt.
Reading whole tracks is pretty hardware specific, and on some non-dma
systems, can't be done because of timing problems.

						George