Date : Tue, 20 Jul 2010 20:48:00 +0000 (GMT)
From : peterdengland@... (peterdengland@...)
Subject: Subject: Re: ADFS Broken Chain - BBC Model B
Thanks very much for your reply Rick. The advice from Rob and yourself is very
useful.
I certainly will not scrap the old card. I look upon recovering the files as a
challenge, and another project!
Best wishes,
Peter
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Sent: Tue, 20 July, 2010 19:02:32
Subject: bbc-micro Digest, Vol 46, Issue 18
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Today's Topics:
? 1. Re: ADFS Broken Chain - BBC Model B (peterdengland@...)
? 2. Re: ADFS Broken Chain - BBC Model B (Rick Murray)
? 3. Free Stuff Tranche III [final reminder] Mid-Day BST on
? ? ? Wednesday 21 July 2010 (Andrew Hancock)
? 4. Free Stuff Tranche III [final reminder] Mid-Day BST on
? ? ? Wednesday 21 July 2010 (Andrew Hancock)
? 5. Free Stuff Tranche III [final reminder] Mid-Day BST on
? ? ? Wednesday 21 July 2010 (Andrew Hancock)
Message: 1
Date: Tue, 20 Jul 2010 11:28:13 +0000 (GMT)
From: peterdengland@...
Subject: Re: [BBC-Micro] ADFS Broken Chain - BBC Model B
To: Rob <robert@...>
Cc: bbc-micro@...
Message-ID: <943153.16127.qm@...>
Thanks very much for your fast response Rob.
I need to get a CF card and, I guess, a CF card reader/writer for the PC would
be wise.
Peter
________________________________
From: Rob <robert@...>
To: peterdengland@...
Cc: bbc-micro@...
Sent: Tue, 20 July, 2010 12:49:51
Subject: Re: [BBC-Micro] 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
? ? ?
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Message: 2
Date: Tue, 20 Jul 2010 17:30:51 +0200
From: Rick Murray <rick@...>
Subject: Re: [BBC-Micro] ADFS Broken Chain - BBC Model B
To: bbc-micro@...
Message-ID: <4C45C12B.3070905@...>
On 20/07/2010 12:49, Rob wrote:
> 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.
...and be aware that one or more files may be corrupt.
For that reason, Rob's advice:
> Then format up a new CF card and restore everything
? ? ? ? ? ? ? ? ? ? ^^^
is very good - keep the original (even if 'borked') until you are
certain you have everything.
I suffered a screwed up root directory on one of my ADFS E floppies many
moons ago. LookSystems disc recovery didn't want to know, and DiscKnight
didn't exist. *CheckMap is pretty useless really, and *Defect is of
limited use.
Needless to say it contained important documents. Backup? Backups were
not pleasant on a single-floppy machine.
I didn't have the PRMs describing the disc layout (I do now and *still*
don't understand it all!).
In the end, I cobbled together a BASIC program to OS_GPBP the entire
disc into memory, so I could then clip out bits of files. It took a fair
amount of work in !Edit to extract control codes and the like from
Ovation files, and then (later) rebuild the file in Ovation. But... for
all the aggravation [*], it was better than saying "oh well".
So, ALWAYS keep the original (even if damaged) until you know you
absolutely no longer need it.
Best wishes,
Rick.
* - TBH I kinda miss those days. Who in their right mind would attempt
? ? such a thing on an NTFS partition? To that end, is there a disc
? ? sector editor that runs in DOS that even understands NTFS? Hell, the
? ? ones I have are *useless* with Flash media (USB, SD...) because
? ? those things use FAT32.
? ? I recall undeleting a file on FAT was dead easy as the FS simply
? ? corrupted the first byte and marked the dir entry as "available".
? ? Given XP does no Recycle bin ops on removable media, and how easy it
? ? is to "oops" delete the wrong file (or too many), it would be nice
? ? to poke the directory manually. I've tried literally dozens of file
? ? recovery programs. They're all slow, and not a single one, not a
? ? *one* has managed to recover an MPEG4 video file in such a way that
? ? anything will recognise it as video. Hex-reading the header, it is
? ? no surprise, it's just junk. Thank goodness 80% of stuff on TV is
? ? repeated, so if I delete the wrong file, set the PVR wrongly (it
? ? uses American mm/dd/yyyy dates so you can imagine the mistake
? ? potential), satellite on wrong channel, programme deferred due to
? ? f*ing world cup extra time... I can just sulk for a few minutes,
? ? then remember to keep an eye open for the next showing. ;-)
--
Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...
Message: 3
Date: Tue, 20 Jul 2010 17:22:01 +0100
From: "Andrew Hancock" <andrew.hancock@... >
Subject: [BBC-Micro] Free Stuff Tranche III [final reminder] Mid-Day
??? BST on??? Wednesday 21 July 2010
To: <bbc-micro@... >
Message-ID:
??? <123001cb2827$b11b40e0$1351c2a0$@hancock@... >
All (final reminder for free stuff requests) (no need to re-email me if you
have already done so! you are in the spreadsheet)
Okay, I've collected some more free Acorn Stuff from another source. it's
untested, was in the attic, before it went into the attic it was serviced
and working.
I've thought long and hard about the following statement:-
These items are gifted to members of the list for non-commercial gain. I'll
try and be fair, and allocate equally, rather than a single member with a
large office, have it all!
items consist of the following
BBC Micros
BBC Micros in Viglen Cases
BBC Masters
BBC Master Compacts
Acorn Electrons
Acorn Electron plus1, plus3
Teletext Adaptors
To be shipped by the courier UPS to UK Destinations. (may consider non-UK).
I'm not doing this for financial gain, just stopping good historical items
going into the skip.
If interested, there are also some boxes of software for Acorn (tapes &
discs), Commodore and Other (I forget!).
But more importantly is a box of software for the Electron which needs to be
archived, or go into a collection, museum etc as software for the Electron
is rather scarce.
I'm afraid I do not have the time to catalogue the contents of the software
boxes.
Please also note, these items are un-tested, may need repair, items are
dirty they come from an attic, they are not new, not guaranteed, you are not
purchasing from eBay, you are not purchasing these items, they are FREE
GIFTS, a payment for p&p is required. No returns.
The Closing Date for people on this list to express an interest in this Free
Stuff is Mid-Day on Wednesday 21 July 2010, It will then be allocated to
people that have expressed an interest to me by email, randomly out of a
hat, I believe this is the only FAIR way of allocating all of the items.
If you have already emailed me your interest, you've already been included.
Regards
Andrew
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Message: 4
Date: Tue, 20 Jul 2010 17:59:44 +0100
From: "Andrew Hancock" <andrew.hancock@... >
Subject: [BBC-Micro] Free Stuff Tranche III [final reminder] Mid-Day
??? BST on??? Wednesday 21 July 2010
To: <bbc-micro@... >
Message-ID:
??? <125101cb282c$f6a631b0$e3f29510$@hancock@... >
Nothing has been allocated to anyone yet, to make it a fair, the free list
giveaway, everyone goes into a hat for the wanted items.
e.g. if you would like a master, your name goes into the Master hat! if
you've expressed an interest in a Master Compact it also goes into the
Master Compact hat
so let me know......before Mid-Day tomorrow.
I believe this is the only fair way of allocating items.
Andrew
http://lists.cloud9.co.uk/pipermail/bbc-micro/attachments/20100720/956bf866/attachment-0001.html
Message: 5
Date: Tue, 20 Jul 2010 18:02:35 +0100
From: "Andrew Hancock" <andrew.hancock@... >
Subject: [BBC-Micro] Free Stuff Tranche III [final reminder] Mid-Day
??? BST on??? Wednesday 21 July 2010
To: <bbc-micro@... >
Message-ID:
??? <127101cb282d$5c2a3360$147e9a20$@hancock@... >
Just found.....Late additions:-
Acorn Second Processor
Acron Tape Casette
Regards
Andrew
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