Date   : Tue, 20 Jul 2010 11:49:51 +0100
From   : robert@... (Rob)
Subject: ADFS Broken Chain - BBC Model B

On 20 July 2010 11:15,  <peterdengland@...> wrote:
> I have a BBC Model B wiith RetroClinic DataCentre
>
> I have a "broken directory".
> I have written a load of stuff on the CF Hard Drive, and really would like
> to recover it, rather than reformat the hard drive and lose it. Needless to
> say it is not all backed up.
>
> Has anyone written a program to fix broken directories, or know how to fix
> them manually (I have ADT installed).
>

From: http://mdfs.net/Docs/Comp/Disk/Format/ADFS

"A directory is reported as 'Broken' if the Master Sequence Number and "Hugo"
strings do not match - bytes 000-004 are compared with bytes 4FA-4FE."


I would suggest the first approach is to patch those bytes to be the
same.  Hopefully that should get you access to the directory, in which
case, backup everything immediately - do not treat the disc as safe to
write to.  Then format up a new CF card and restore everything - once
you are happy you have got everything across you can re-format the old
card..

Rob