Thomas Schmitt wrote:
Hi,
i am the developer of xorriso, which created the image in question
under control of the debian-cd package.
Debian i386 images are ISO 9660 filesystems with El Torito Boot Record
to boot from CD/DVD/BD, and with Master Boot Record, which enables
them to boot from hard disk and USB stick.
If you put an ISO 9660 image onto the overall device file of an
USB stick (e.g. /dev/sdb) then it should be mountable by the
overall device file of the stick, too:
dd if=debian-7.3.0-i386-netinst.iso of=/dev/sdb
mkdir /mnt/my_debian_7_1
mount -t iso9660 /dev/sdb /mnt/my_debian_7_1
To then see all its files, do
find /mnt/my_debian_7_1
Some technical background:
El Torito and MBR are only present for pointing BIOS to the boot files
which it shall execute to bring up an operating system.
The MBR might have a confusing impact on programs which inspect
devices and try to be smart. A program which simply complies to
the specs of ISO 9660, El Torito, and MBR should have no problem.
The El Torito stuff already was shown here by the output of isoinfo.
The MBR can be made visible by a run of fdisk on the .iso file
/sbin/fdisk -lu debian-7.3.0-i386-netinst.iso
or if already on USB stick /dev/sdb, by
/sbin/fdisk -lu /dev/sdb
which should yield:
Device Boot Start End Blocks Id System
/dev/sdb1 * 64 567295 283616 17 Hidden HPFS/NTFS
This means that there is a MBR partition 1 with some filesystem.
(The System type is prescribed by the ISOLINUX project.)
By a special preparation of the ISO image, it should be possible
to mount it as superuser by the partition device file, too:
mount -t iso9660 /dev/sdb1 /mnt/my_debian_7_1
The reason why both device files /dev/sdb and /dev/sdb1 work for
mounting is that the ISO has two superblocks and directory trees.
One pair ready for mounting from /dev/sdb and for mounting from
CD/DVD/BD. The other pair is ready for mounting /dev/sdb1.
For details see:
http://libburnia-project.org/wiki/PartitionOffset
Have a nice day :)
Thomas
Beginning to see the light. Glanced at the link. Will need my
morning coffee before detailed read. Motivation behind some of my
odder choices is maximizing my education. If retirement isn't for
education, what use is it.
Thank you.
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