On Thu, May 8, 2008 at 12:49 PM, Albert Hopkins <marduk@(protected):
<SNIP>
>
>     $ isoinfo -d -i os200805.iso

Great stuff. Thanks. OK, using your command but changing it to the
drive itself I got this:

~ # isoinfo -d dev=/dev/hdb
CD-ROM is in ISO 9660 format
System id: LINUX
Volume id: FreeDOS 1.0
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:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 78305
El Torito VD version 1 found, boot catalog is in sector 364
NO Joliet present
Rock Ridge signatures version 1 found
Eltorito validation header:
  Hid 1
  Arch 0 (x86)
  ID ''
  Key 55 AA
  Eltorito defaultboot header:
    Bootid 88 (bootable)
    Boot media 0 (No Emulation Boot)
    Load segment 0
    Sys type 0
    Nsect 4
    Bootoff 16D 365

I then used dd to make a file:

~ # dd if=/dev/hdb of=FreeDOS.iso
dd: reading `/dev/hdb': Input/output error
313568+0 records in
313568+0 records out
160546816 bytes (161 MB) copied, 55.8198 s, 2.9 MB/s

I don't like the Input/Output error message but it did create a file
which gives the same info using isoinfo:

~ # isoinfo -d -i FreeDOS.iso
CD-ROM is in ISO 9660 format
System id: LINUX
Volume id: FreeDOS 1.0
Volume set id:
Publisher id:
Data preparer id:
Application id: MKISOFS ISO 9660/HFS FILESYSTEM BUILDER & CDRECORD
CD-R/DVD CREA TOR (C) 1993 E.YOUNGDALE (C) 1997 J.PEARSON/J.SCHILLING
Copyright File id:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 78305
El Torito VD version 1 found, boot catalog is in sector 364
NO Joliet present
Rock Ridge signatures version 1 found
Eltorito validation header:
  Hid 1
  Arch 0 (x86)
  ID ''
  Key 55 AA
  Eltorito defaultboot header:
    Bootid 88 (bootable)
    Boot media 0 (No Emulation Boot)
    Load segment 0
    Sys type 0
    Nsect 4
    Bootoff 16D 365


Now, how does one turn this ISO image back into a set of files and
folders to be changed and later turned back into an ISO image?

I see Joerg Schilling has responded. That's a famous name in this
area. Off to read his pages!

- Mark
--
gentoo-user@(protected)