Date   : Mon, 14 Jun 1999 23:23:30 +0100
From   : Steven Flintham <steven@...>
Subject: Re: BBC software to grab DFS disc images

On Mon, Jun 14, 1999 at 10:58:54AM +0200, Robert Schmidt wrote:
> With your suggested scheme, such space saving is not too easy:
[...]
> - you'd need to extend the format to tell any reading tool how many
>   tracks there are (if you'd like to support 40T).

I'm pretty sure this information (more precisely, the number of
sectors) is embedded in the first two sectors of track 0 on each side.
If this is correct, I think this limitation could be worked round
without extra data, although it would be slightly tedious having to
work out the size of the first side before accessing the second side
(if there is one).

This assumes standard DFS format, but I'm not sure that's a problem in
itself as only protected discs would be different (AFAIK) and I doubt
any format along these lines will work in this case.

Steven