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Re: [gentoo-user] [OT] Reading, editing and then burning a new ISO
image using Gentoo

Joerg Schilling

2008-05-08

>It's a boot (floppy image) that's not part of the ISO filesystem per se.
>A quick 'Net search shows you might be able to do this following

>http://kiss.molteni.net/

>I tried that on an Open Solaris ISO and got:

>     $ isoinfo -d -i os200805.iso
>     CD-ROM is in ISO 9660 format
>     System id: Solaris
>     Volume id: OpenSolaris-2008-05
>     Volume set id:
>     Publisher id:
>     Data preparer id:
>     Application id: MKISOFS ISO 9660/HFS FILESYSTEM BUILDER &
>     CDRECORD CD-R/DVD CREATOR (C) 1993 E.YOUNGDALE (C) 1997
>     J.PEARSON/J.SCHILLING
>     Copyright File id:
>...
>     $ dd if=os200805.iso of=boot.img bs=2048 count=4 skip=105
>     4+0 records in
>     4+0 records out
>     8192 bytes (8.2 kB) copied, 6.7118e-05 s, 122 MB/s
>    
>     $ file boot.img
>     boot.img: isolinux Loader

Caution: the file is much larger and it is most likely not isolinux but
Stage 2 from Grub.

BTW: Nsect == 4 means 2048 Bytes. This is because many BIOS versions
will not boot unless the CD looks exactly as broken as a WIN-NT CD:

See mkisofs man page for more details.....

ftp://ftp.berlios.de/pub/cdrecord/alpha/

Jörg

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