Date : Mon, 13 Apr 2009 21:30:42 +0100
From : bbcmailinglist@... (Ian Wolstenholme)
Subject: Writing BBC Disc Images on Linux
I think part of the problem might be that I don't appear to be able to read
double density 720K discs on my computer under Ubuntu - I have put
some messages on the Ubuntu forums to see if anyone can help.
Best wishes,
Ian
----- Original Message -----
From: Ian Wolstenholme [mailto:bbcmailinglist@...]
To: bbc-micro@...
Sent: Wed, 8 Apr 2009 14:10:18 +0100
Subject: Re: [BBC-Micro] Writing BBC Disc Images on Linux
The dd command on its own didn't work, it just gave me an Input/Output
error after a few seconds of attempted disc access.
Could anybody give me the correct syntax I would need to use for the
fdutils command to be able to access the most common BBC disc formats,
e.g. Acorn DFS 80T, 40T, ADFS 640K etc.
Many thanks.
Best wishes,
Ian
----- Original Message -----
From: Phill Harvey-Smith [mailto:afra@...]
To: bbc-micro@...
Sent: Tue, 07 Apr 2009 00:52:00 +0100
Subject: Re: [BBC-Micro] Writing BBC Disc Images on Linux
me@... wrote:
> On 6 Apr 2009, at 21:29, Michael Firth wrote:
>
>> Surely that will only work if the target floppy is already
>> formatted to match the image you want to write to the disk?
>
> No, it's doing a raw write to the floppy device. In fact it will
> destroy any formatting already on the disc and replace it with
> however the disk image is formatted.
That's simply NOT true, yes it will overwrite the sectors on the disk
with the data from the image, but it will NOT format the disk or change
the layout of sectors on the disks.
In fact without additional configuration you will not be able to read
BBC disks due to them being single density (Acorn DFS), and 256
bytes/sector (DFS and ADFS).
The fdutils package can be used to configure the drive correctly,
including doing things like double stepping if using a 40 track disk in
an 80 track drive, the one thing you have to remember to do is use
fdutils to set the parameters every time you change disks.
I can't remember off hand if I have used linux to read DFS disks, but I
have successfully read/written Dragon 32/64 disks under linux using
fdutils and dd. (Dragon disks are 40 or 80 track single or double sided,
and 18 x 256byte sectors per track).
> This only works for disk images that lack any kind of header and are
> basically just a binary dump of the disc - I don't know whether .ssd
> qualifies. .dsd certainly does not.
This part is true.
Dammit, I meant to send this to the list the brain-dead list reply
policy strikes again ! David apologies if I seemed like I was getting
stroppy, that's not what I intended :)
Cheers.
Phill.
--
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !
"You can twist perceptions, but reality won't budge" -- Rush.
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