Date   : Wed, 15 Dec 1999 19:46:32 +0000
From   : Graham Bisset <graham@...>
Subject: Re: Disc Format (fwd)

At 14:51 15/12/1999 +0000, you wrote:
>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. 

The Challenger format used the first track to store catalogue info.  Track
0 Sector 0 and Sector 1 were as DFS.  T1S2/T1S3 were for volume 0B etc right
up to OH.  

On the Challenger, use VOLGEN to see which volumes are in use.

Cheers
Graham