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To: Terry Lambert <terry@lambert.org>
cc: joerg_wunsch@uriah.heep.sax.de, freebsd-hackers@FreeBSD.ORG,
        jleppek@suw2k.hisd.harris.com
Subject: Re: bootable CD's (fwd) 
In-reply-to: Your message of "Wed, 10 Jul 1996 14:12:26 PDT."
             <199607102112.OAA27270@phaeton.artisoft.com> 
Date: Thu, 11 Jul 1996 01:50:03 -0700
Message-ID: <7773.837075003@time.cdrom.com>
From: "Jordan K. Hubbard" <jkh@time.cdrom.com>
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Look, guys, don't sweat it - I wouldn't even know how to burn
boot-blocks onto a CD anyway, not to mention the fact that it'd have
to work under FreeBSD too since FreeBSD is also now my CD production
platform. :-)

					Jordan

> > > If anyone comes up with any pointers I am willing to give it a try, I am
> > > also trying to get the info from gigabyte.
> > 
> > What magic do you expect?
> > 
> > I don't know, but i would blindly assume that booting the CD will be
> > done in the same way as booting any other device.  The BIOS code
> > searches all available devices, and tries to load the very first
> > sector onto address 0:0x7c00.  If the loaded sector ends in 0x55aa, it
> > will simply be executed.  It's up to the executed code to decide what
> > needs to be done next.  That's why you could put a boot-selector MBR
> > there, or you could put the 7.5 KB BSD bootstrap there as well.
> > 
> > CD-ROM sectors are 2 KB, not only 512 bytes, but who says you cannot
> > examine the very first 512 bytes only?
> 
> Read the Joliet specification from Microsoft.
> 
> I expect that the Adaptec boot code conforms to this specification.
> 
> Conforming boot code will read the first sector from the first
> *session* of a multisession CD, rather than the first sector from
> the CD itself.
> 
> 
					Terry Lambert
> 					terry@lambert.org
> ---
> Any opinions in this posting are my own and not those of my present
> or previous employers.