Date: Fri, 23 Oct 1998 17:40:49 -0400 From: "Larry S. Marso" <larry@marso.com> To: freebsd-questions@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: solved: writing multisession cd9660 Message-ID: <19981023174049.A3035@marso.com>
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I didn't find a clear explanation in the mailing list archives or
elsewhere of how to create a multisession ISO_9660 CD.
I succeeded as follows:
#1 Create the first session
mkisofs -R -o cdimage.raw /dir1
^^^^^ The directory of files you're backing up
^^^^^^^^^^^ The first iso_9660 image file
cdrecord -v -multi dev=2,0 speed=2 cdimage.raw
^^^^^ instructs cdrecord to anticipate multiple sessions
so that disk fix permits later additions
I've found it's important to **save** the cdimage.raw file (which is
downright inconvenient ... please share with me any alternatives you
uncover),
#2 Create the second image
You need to feed mkisofs information on the most recently recorded session,
in order to create the next session. This is an *undocumented* mkisofs
command.
cdrecord -msinfo dev=2,0
This command outputs the 2048 block information on the most recent
session. E.g.: 0,15715
mkisofs -R -M cdimage.raw -C 0,15715 -o cdimage2.raw /dir2
^^ An undocumented option. Include the range of
the most recent session
^^ mkisofs seems to require that you feed it the actual image
from the most recent session. If that's days or weeks ago,
this is pretty inefficient. I couldn't satisfy mkisofs by
offering it the mounted cd session created with cdimage.raw.
Maybe there's a way to recreate cdimage.raw from the
mounted disk? Solutions appreciated!
You can now:
cdrecord -v -multi dev=2,0 speed=2 cdimage2.raw
#3 Mounting the resulting sessions
You can use
tosha -i
or
cdcontrol info
to get the start sectors of the included sessions. Then mount as follows:
mount_cd9660 -s 15716 /dev/cd0c /mnt
^^^^^^^^ This is the start sector of the second session, which
is hereby mounted.
Limitations:
- You can't mount more than one session simultaneously
- There's no support I've found for creating some sort of directory of
all sessions.
Best of luck!
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