Bug#851628: Bugs on First CD/DVD for Jessie 8.5, 8.6, 8.7

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

schatzclan wrote:
> unexpectedly larger
> actual file size (642M) vs reported size (613M) for the “i386 8.x.0 LXDE
> CD#1” iso.

This is explainable from the difference of programmer's MiB and IEC's MB:

  642.0 / 1024 / 1024 * 1000 * 1000 = 612.2589111328125


> The “i386 8.5.0 XFCE CD#1” ISO image mounted cleanly on the mac laptop

Is this the "1997-vintage" machine ? (Or is it a third machine standing by ?)


> "i386 8.6.0 DVD 1" ISO image - iso was damaged although checked OK via MD5,

Most probably not by transport. After all it is very unlikely to get
the same MD5 by accident.


> nor would it mount on a Mac Laptop [...]
> Could it be that the hybrid CD/USB iso is causing problems?

A while ago, there was a discussion here

  https://lists.debian.org/debian-cd/2011/04/msg00029.html
     Start of thread

  https://lists.debian.org/debian-cd/2011/04/msg00038.html
    "snow leopard [...] The following disk image could not be opened:
     debian-6.0.1a-i386-DVD-1.iso - no mountable file systems"

  https://lists.debian.org/debian-cd/2011/04/msg00042.html
    "I do confirm that after removing the isohybrid of the image, I am
     able to mount it."

The mountable ISO was made from the not mountable one by:

  dd if=/dev/zero bs=2K count=16 >test_image.iso
  dd if=/dvdbuffer/debian-6.0.1a-i386-DVD-1.iso bs=2K skip=16 >>test_image.iso

(The result won't boot from USB stick, of course.)

---------------------------------------------------------------------

The only difference i can spot between isohybrid equipment of
  debian-8.5.0-i386-lxde-CD-1.iso.1
and
  debian-8.6.0-i386-DVD-1.iso
is the size of the ISOs and the fact that the DVD image has no consistent
Cylinder/Head/Sectors geometry.

I now repacked debian-8.6.0-i386-DVD-1.iso by xorriso-1.4.6 (as of Sid)
and got consistent CHS geometry (238 heads/cyl, 32 secs/head).

Repacking to "test.iso" was done by:

  mount debian-8.6.0-i386-DVD-1.iso /mnt/iso

  xorriso -as mkisofs \
     -o test.iso \
     -V 'Debian 8.6.0 i386 1' \
     --modification-date='2016091713290100' \
     -isohybrid-mbr --interval:local_fs:0s-15s:zero_mbrpt,zero_gpt,zero_apm:'debian-8.6.0-i386-DVD-1.iso' \
     -partition_cyl_align off \
     -partition_offset 0 \
     -apm-block-size \
     -c '/isolinux/boot.cat' \
     -b '/isolinux/isolinux.bin' \
        -no-emul-boot -boot-load-size 4 -boot-info-table \
     -eltorito-alt-boot \
     -e '/boot/grub/efi.img' \
        -no-emul-boot -isohybrid-gpt-basdat -isohybrid-apm-hfsplus \
     /mnt/iso
    

Have a nice day :)

Thomas