24 May
2000
24 May
'00
11:18 p.m.
On May 24, 17:45, Chuck McManis wrote:
In an effort to preserve all my miscellaneous driver
floppies I've been
copying them to CD-rom. I figured I should also do this for my DOS 6.3
disks but realized that I don't know how to create a bootable DOS 6.3
system disk from the disk itself. I've considered using dd(1) on unix to
create just the disk image that I can later use dd to copy back out but
was wondering if perhaps there was a better way.
As Roger pointed out, you're better to keep a boot floppy (or several
varieties) -- it's more reliable. Bootable CDs require BIOS support which
not all BIOSes have.
On May 25, 0:56, Eric Smith wrote:
What I use on Linux to back up images of 1440K
floppies is:
dd if=/dev/fd0 of=floppy.img bs=18k
[...]
There's a DOS program called "rawrite"
that can recreate floppies
All true, and Chuck may find it useful to have several floppy images on a
CD, but that won't make the CD bootable.
An IDE CDROM doesn't look the same as an IDE hardrive, as far as the BIOS
is concerned, so 'dd' from a bootable harddrive won't work.
On Wed, 24 May 2000, Richard Erlacher wrote:
don't know what the appropriate spec for a
bootable CD would be. I do
recall that ISO9660 or whatever it was is NOT the right format.
If you want a bootable CD for a PC, you *do* make it ISO 9660 format but
with an El Torito boot catalog addition (Carlos was right about the name).
As far as I remember, what this actually does is make a CD that has an
image of a boot floppy embedded within it, but if you really want to know
how it works, look in Andy McFadden's CD-R FAQ, or check the standard at
http://www.ptltd.com/techs/specs.html .
The "bootableness" isn't a function of DOS, by the way; it's a function
of
the BIOS, and you would make a bootable Linux CD the same way.
On May 24, 20:47, Charles P. Hobbs (SoCalTip) wrote:
"High Sierra"???
FYI, High Sierra is nothing to do with El Torito -- it's the name of the
format system used prior to the ISO 9660 standard, and from which the ISO
standard was derived.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York