Date   : Wed, 11 Apr 2001 20:03:10 +0200
From   : Isabel Cisternas & Robert Schmidt <rschmidt@...>
Subject: Re: Moving PC-BBC

It's worth mentioning the double sided images are stored with the two
sides interleaved, according to the "BeebEm DSD standard" (I quote):

"
Two forms of disc image are presently supported.  The first is single
sided
format.  This consists of a raw disc image of a beeb, 10 sector per
track, 256
byte per sector disc side.  So the image is ordered
  track 0,sector 0,
  track 0,sector 1,
         .
  track 0,sector 9,
  track 1,sector 0

  etc.

The double sided format uses interleaved tracks:
  track 0,head 0, sector 0,
            .
  track 0,head 0, sector 9,
  track 0,head 1, sector 0,
            .
  track 0,head 1, sector 9,
  track 1,head 0, sector 0,
            etc
"

Robert


Richard Gellman wrote:
> 
> > HOWEVER, all the really popular discs (like Elite, Spy Hunter etc)
> > always come in this SQUASHED format, designed for BBC emulators, not
> > for writing to a BBC disc.
> 
> Squahed?
> 
> Um no ;P
> 
> ... [great explanation deleted]