[BBC-Micro] Disc formats -- DFS/ADFS and the Master Welcome Disc

Chris Thornley C.J.Thornley at coolrose.fsnet.co.uk
Thu Jan 21 02:12:45 GMT 2010

I think the master welcome disk is specially formatted 80 Track disk.
It will contain some blank unformatted tracks.
The tracks are writen so they accessable by 40 track drives and should
contain some code that will allow it to double setep in 80 track drivres
when booted effectivly being used as a 40 track disk.

Have a look at another util called Disk2FDI and the acorn presvation site
which has some BBC FDI images.



               />      Christopher J. Thornley is cjt at coolrose.fsnet.co.uk
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-----Original Message-----
From: bbc-micro-bounces+c.j.thornley=coolrose.fsnet.co.uk at lists.cloud9.co.uk
[mailto:bbc-micro-bounces+c.j.thornley=coolrose.fsnet.co.uk at lists.cloud9.co.
uk] On Behalf Of Philip Pemberton
Sent: 21 January 2010 2:00 AM
To: BBC micro mailing list
Subject: [BBC-Micro] Disc formats -- DFS/ADFS and the Master Welcome Disc

Hi guys,
I'm not sure if I've mentioned my disc analyser project here, but basically
it's a "magic box" (plus software) that plugs into a USB port and makes a
transition-timing-level image of a floppy disc, which can then be decoded,
written back, etc.

I've just read in a BBC Micro disc -- specifically the dual 40/80 track
Master Welcome Disc. Oddly enough, track 0, head 0 seems to be utterly
mangled -- DiscTool IDs it as "noise". Tracks 1 and 2 (both heads) seem to
be fine -- they're ID'd as "MFM, modified IBM System 34/ECMA format". 
I haven't tried decoding any of the other tracks.

Does anyone know if t00h0 is formatted differently on the Master welcome

I'm also interested in any information folks might have on the DFS and ADFS
formats (especially the 800K and 1.6MB ADFS "E" formats used on the Acorn
Archimedes/RiscPC systems). I noticed JGH has some info on DFS and the
earlier versions of ADFS, but ADFS-E info seems to be a bit thin on the
ground.... :-/

philpem at philpem.me.uk

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