Hi, Dave wrote: > i have downloaded debian-9.4.0-amd64-DVD-1.iso > when i double click on it, it says cannot open. the iso > debian-9.4.0-amd64-DVD-2 and iso debian-9.4.0-amd64-DVD-3 > i can open and read. the same thing happened with debian 9.0.0. > i am using mac pro 10.10.5 to download / open / and hopefully burn.
While waiting for the ISO to arrive, i dig in old memories. Several years ago, there was a report about an i386 DVD-1 on Mac "Snow Leopard": https://lists.debian.org/debian-cd/2011/04/msg00029.html Proposal to remove USB stick equipment: https://lists.debian.org/debian-cd/2011/04/msg00040.html Confirmation of success: https://lists.debian.org/debian-cd/2011/04/msg00042.html Proposal of quicker workaround: https://lists.debian.org/debian-cd/2011/04/msg00045.html Beginning theory about partition offset 16: https://lists.debian.org/debian-cd/2011/04/msg00060.html Confirmation (?) of that theory: https://lists.debian.org/debian-cd/2011/04/msg00061.html It once even had an Apple Bug Id: https://lists.debian.org/debian-cd/2011/04/msg00066.html Partition offset 16 was later disabled in debian-cd because of a xorriso bug which has been fixed soon after. So i wonder ... Ah. Download completed. $ xorriso -indev debian-9.4.0-amd64-DVD-1.iso -report_system_area plain ... Partition offset : 0 ... So this time it is not about partition offset. Nevertheless, it is worth a try to zeroize the image part with the boot entry points for USB stick: MBR, pseudo-GPT, Apple Partition Map. The quick way is: # Make backup of USB boot equipment dd if=debian-9.4.0-amd64-DVD-1.iso bs=2048 count=16 \ of=debian-9.4.0-amd64-DVD-1.system_area # Overwrite USB boot equipment by zero-bytes dd if=/dev/zero bs=2048 count=16 conv=notrunc of=debian-9.4.0-amd64-DVD-1.iso The resulting ISO image is supposed to still boot from DVD. But if you want to boot it by the Mac, nothing is for sure. Better first try with the unaltered ISO image. (When booting Debian, the quirks of MacOS are inconsequential.) Have a nice day :) Thomas
