how to burn iso to cd under Catalina with Finder???

It does work, but for some reason the process has become very unntuitive.

Use the finder and double click on the iso file to mount it.

From the file menu within the finder you will find an option to burn. Select it.

I have exactly this problem-- I was trying to burn a Linux ISO and it just doesn't work-- my guess is that it tries to mount it and fails.

However, I found this article http://osxdaily.com/2015/11/22/burn-disc-images-os-x-finder/ and it worked for me:

hdiutil burn ~/Path/To/DiskImageFile.iso

I was able to get it to work after doing some more research.

1. First open the iso by double clicking on it.
2. Put the blank disk in your DVD rom.
3. When the dialogue box comes up to run black DVD click open which will place the dvd on your desktop.
4. Go back to the mounted iso folder with your file.
5. Now go to file and burn like you would normally do.

Thats it, and it worked for me with out a issue.

Doesn't work for me: I can't even open (=mount) the ISO.

Tried different CentOS and PuppyLinux ISOs - which work fine on other computers, including my Mojave MB Pro, but won't open on my Catalina MB Pro.

tklettke wrote:

Doesn't work for me: I can't even open (=mount) the ISO.

Tried different CentOS and PuppyLinux ISOs - which work fine on other computers, including my Mojave MB Pro, but won't open on my Catalina MB Pro.

Because these are bootable raw images containing multiple partitions macOS may not be able to mount them. You can create a bootable USB drive from these Linux .iso files using Etcher.

I don't have a solution but I am pretty sure it's kernel level. I've tried it on etcher with the same results. The reason I think it's kernel level is because when I tried to "dd" in the command line it gave me an "oprand" error for the iso. Dudes....if it's not broke don't fix it.

The reason I use Mac is because it's a flashy *nix that runs Adobe. Seriously considering an X1 Carbon and getting Adobe to run in a VM. I know it would be a pain but so are the issues with this new OS.

The operating system will mount Apple, FAT, exFAT, and NTFS filesystems. It has never known how to mount Linux filesystem content. So, the message that you report is correct.

The old command-line .iso to mounted device burn that I have used in the past was:

sudo dd if=/path/to/.iso of=/dev/rdiskn bs=1m

where rdiskn is the CDROM or USB stick device name.

I have not tried UNetbootin or Etcher on Catalina as had no reason too, and they may not be 64-bit apps.

One of the Linux CD images I was referring to above (bionicpup64-8.0-uefi.iso) is a ISO9660 image. Please note that I have no problem burning the same image on my older (2015) Macbook Pro under Mojave, via the "Burn Disk Image" context when selecting the file in Finder. When I do the same on my Catalina MBPro it shows "Could not burn ... The disk image is invalid".

Also notice that the Catalina MBPro will open the actual CD that I burned on the Mojave machine just fine. Thus it's not a matter of Catalina not reading the file system, but it not being able to mount the ISO image.

If you would like to try it yourself - here is the link to the ISO:

http://distro.ibiblio.org/puppylinux/puppy-bionic/bionicpup64/bionicpup64-8.0-uefi.iso

Doesn't mount...I'm just restoring from an old backup with the previous version of the OS. Catalina isn't supporting my outdated Adobe CS6 anyway so that is three strikes (Adobe, iso issues, keyboard issue-Mac problem, not new OS). Restore.

This is the last Mac I will personally own. And probably won't recommend them any more. If Adobe was supported natively on Linux...I think Apple would lose a good portion of its user base.

I just got off the phone with a senior Apple engineer and they have confirmed that this is a known issue with Catalina and they are working on it. In the meantime, the workaround is to go to Terminal and use this command:

hdiutil burn <filepath>

Command line way worked for me.

BTW, FYI - there's another problem, ubuntu isos are unable to be opened/mounted by Finder or Disk Utility as a result how iso was prepared - so called 'hybrid iso':

https://askubuntu.com/questions/153833/why-cant-i-mount-the-ubuntu-12-04-installer-isos-in-mac-os-x

You are correct about the process lacking intuitiveness on Catalina, but your answer was most helpful. The label on the open window bears no resemblance to the name of the ISO file, but Finder seemed quite happy to write the open folder to the blank disk.

mmm... I have just discovered this exact problem on macOS Catalina 10.15.3 on a Mac Mini 2014 with a USB Superdrive.

Right click on a bootable iso file, and try to burn it...."The disk image is invalid."

Tried to do a dd to the raw device file of the superdrive. Would not do it! Must be a change at the kernel level!

Then tried the hdiutil that has been mentioned. Seemed to successfully write the file, but that DVD would not boot properly on a PC.

Then suspected the iso file itself even though it's SHA-256 was OK. Tried it on an ESXi VM and it booted fine!

The problem is definitely within Catalina! Not good!!

Just called Apple Support who confirmed it, but no note of a fix yet.

Now I am going to try my USB Superdrive on a Windows 10 PC with Apple Bootcamp drivers....but this should not be this difficult!!!

Come on, Apple!! :)

If only it's that simple. You should really read more of the thread though, we have tried multiple things and it hasn't worked. It has a defect opened to Apple, just waiting for someone at Apple pick it up.

It's only because I read the whole thread akjeff, that I discovered this process/solution. It's on page one. The post from jlmallard suggested they'd tried several other solutions and this was the first time they'd discovered the problem.

They might not have tried the solution on the first page. It worked for me (and all the people on page 2 - you should read it).