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how can I open / modify a (linux) ISO?

If I try to open it via DiskUtility it says The disk you attached was not readable by this computer.

The image is the current release of ArchLinux: https://www.archlinux.de/download

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  • The format of the image is likely not supported by macOS. Just like Windows doesn't natively read APFS, macOS likely does not read whatever format that disk is.
    – Steve Chambers
    Jan 14, 2022 at 19:52
  • Do you have an Intel or an M1 Mac?
    – nohillside ♦
    Jan 14, 2022 at 20:08
  • @nohillside M1 MacbookAir. Steve How can I open it? I need to modify the boot ISO
    – binaryBigInt
    Jan 14, 2022 at 20:15
  • Using parallels.com/products/desktop to boot an ARM-based Linux system and accessing the ISO from there might work.
    – nohillside ♦
    Jan 14, 2022 at 20:33
  • 2
    An ISO isn't something you "open"... it's a filesystem. So if you want to modify it, you need to recreate it. The easiest way to do that is to do it where it's supported.
    – Marc Wilson
    Jan 15, 2022 at 0:51

1 Answer 1

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On my M1 Mac with macOS 12.3 (Monterey), double-clicking the ISO produces no result. You have to use the terminal to attach the image, (optionally) create a mount point and mount the filesystem.

Attach the ISO to a loop device:

$ hdiutil attach -nomount ubuntu-22.04-live-server-amd64.img
/dev/disk4           GUID_partition_scheme
/dev/disk4s1         Microsoft Basic Data
/dev/disk4s2         EFI
/dev/disk4s3         Microsoft Basic Data

Then arrange the mount:

$ mkdir -p ubuntu
$ mount -t cd9660 /dev/disk4s1 ./ubuntu
$ ls -l ubuntu

If you use a multipart ISO, you can concatenate the files together (this may or may not work):

$ cat part1.iso part2.iso > merged.iso
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