Text 16860, 72 rader
Skriven 2006-03-26 15:54:18 av Jeff Guerdat (1:229/2000)
  Kommentar till text 16836 av Gordon Huff (1:106/2000.0)
Ärende: Creating an ISO image
=============================
Gordon Huff -> Jason Lamb wrote:
 JG>> There are 3 ways to create a bootable CD,

 GH> They are:
 GH> 1. Use a utilty program like Roxio, Sonic or Nero.
 GH> 2. Use a hex editor and follow the "El Torito" spec
 GH> to create the boot image directly. Examples on the web.
 GH> 3. Use a tool like WinImage (Gilles Vollant?) to
 GH> change an existing bootable CD (like the Windows XP
 GH> Install CD) to do what you want.

Well, that's a different twist.

 JG>> assuming your software
 JG>> supports them.  First is floppy emulation, second is hard drive
 JG>> emulation and third is no emulation.

 GH> This is not the way I read the El Torito spec.

Better re-read it, then.  These are the only ways to create a bootable CD. 
These are why the various software packages support them.  The only way to
create a bootable ISO image is to use the hex editor, etc. that you refer to
above - basically, create a boot loader for the CD that will start a program
elsewhere in the CD structure.  The other options are to use a bootable floppy
or hard drive and get the software to read the boot info so it can be written
appropriately as a boot loader on the CD.  The various MS bootable CDs are all
done in no emulation mode. It's easy to tell - floppy emulation will refer to
the boot session as A; even if there's a floppy drive installed.

 JG>> Hard drive emulation requires that the hard drive partition be
 JG>> no larger than the media on which it is written.  You'd be
 GH> hard-pressed
 JG>> to shrink XP down that far.

 GH> Yes and no. You'll be hard pressed to fit 2 GB onto a CD
 GH> without a compressed file system. On the other hand,
 GH> the WinXP install disk ***is*** a CD -- and CD sized!
 GH> (The WinPE disk is a bootable XP and it's 345 MB.)

Except that he wanted to copy his XP disk to removable media.  There's no way
to use an XP or Bart CD to run off CD as if from an existing installation.  DVD
would have the capacity but not the writeability.

 JG>> You may be able to use a DVD but whether the software
 JG>> supports that depends on the vendor.

 GH> I note in passing that the latest Knoppix is a bootable DVD.

Seems like most Linux vendors support that.  Of course, that doesn't have
anything to do with Jason's request.

 JG>> In any event, you'd need to modify XP to write to a RAM disk or other
 JG>> media since the CD/DVD is read-only.  No way to write to the registry
 JG>> or various files that the OS needs to modify in order to run.  It's
 JG>> possible to create such a beast but it would take a lot of work on
 GH> your
 JG>> part to do so...

 GH> This why you want something like the BartPE disk.

Won't help except to repair or twiddle with the system when not booted from the
hard drive.  As I understood the question, it had to do with making a usable
copy of his OS on CD...


-- 
Jeff Guerdat

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