[syslinux] How is a isohybrid --partok image to be used ?
Thomas Schmitt
scdbackup at gmx.net
Fri Jun 27 00:22:50 PDT 2014
Hi,
H. Peter Anvin:
> It means that the .iso can be booted from a partition using any of the
> standard MBRs (not necessarily altmbr),
But the --partok MBRs (isohdpp*) stem from altmbr ?
If so: don't they need the partition number patched in ?
(If not: i have to rethink the link to article "Mbr" at
http://www.syslinux.org/wiki/index.php/Isohybrid#MBR_selection
)
> One of the main uses is for backup partitions -- often distros want a
> filesystem that cannot be written for that, and iso9660 fits the bill.
Are examples known ?
Up to now i have to stay quite vague in
http://www.syslinux.org/wiki/index.php/Isohybrid#Images_prepared_with_--partok
"==Images prepared with --partok==
ISO images, which were prepared by --partok resp. with
MBR isohdppx*.bin, have to be copied to a partition device.
E.g. /dev/sdb1 rather than /dev/sdb.
Such an ISO partition may then be booted by chainloading or
by a suitable MBR at the start of the base disk device.
"
I hope this is at least not wrong.
Whatever, it would not suffice for myself to really create such
a disk or USB stick. (Courageous experimenters wanted.)
---------------------------------------------------------------
Further i wonder how --partok does play with --gpt.
Afaik, there is no equivalent to VBR in GPT.
So can it be that GPT in the ISO image is useless if the image is
put into a partition ?
Does the installing user have to compute an own GPT entry from a
listing of the GPT in the image ? (Or from the MBR patition table
in the image.)
Have a nice day :)
Thomas
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