Date   : Wed, 08 Apr 2009 17:00:44 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Writing BBC Disc Images on Linux

me@... wrote:
> This only works for disk images that lack any kind of header and are
> basically just a binary dump of the disc - I don't know whether .ssd
> qualifies. .dsd certainly does not.
 
SSD is a binary dump of the contents of a sequential disk image. It
goes track 0 sector min..max, track 1 sector min..max, track 2
sector min..max, etc.
 
DSD is a binary dump of the contents of an interleaved disk image.
It does track 0 sector 0..9, track 1 sector 0..9, track 0 sector
0..9, etc.
 
If the /filesystem/ stored in that disk image uses the disk
sequentially (eg DFS, ADFS S/M/L), then you should store it in a
SSD file.
 
If the filesystem stored in that disk image uses the disk
interleavedly, then you should store it in a DSD file.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
RISC OS Internationalisation - http://mdfs.net/Software/RISCOS