Date   : Wed, 15 Dec 1999 14:51:42 +0000 (GMT)
From   : Tom Seddon <T.W.Seddon@...>
Subject: Re: Disc Format (fwd)

On Wed, 15 Dec 1999, Peter Hatton wrote:

> There was another more popular kit floating around as well, but the name
> escapes me.

The Watford DFS had 16 sectors/track. The Opus DDOS and Challenger had an
18-sector format; see if ddosconv from my emulator (at last! it might come
in useful :-) will cope with it.

For DDOS, the first couple of sectors are indeed as per DFS; they are the
catalogue for the first 'volume' on drive 0. (Volumes are named by letter;
so you can have 0A, 0B, 0C, 0D... up to 0G IIRC.) The catalogue for 0B
appears later, if it appears at all; and somewhere on the disk there's a
list of which volumes are present and where their catalogues are located. 

If it is DDOS, I can post the ddosconv source somewhere so people can look
at it and work out the format from that -- I don't have time to do this
myself until after my exams in January.

--Tom
this space filled with this | this space not filled with this space filled
intentionally ............. | with this intentionally unintentionally ....

PS Peter, this got sent to you by mistake first time; this copy is going
to the list. Sorry about that!