CD/DVD burning broken under MacOS Sequoia

Patrick Denny wrote:

True enough for straight file copying, but Sequoia WILL NOT burn a disk image (ISO) properly. A disaster for many of us who still play and store from physical media. Apple? Apple?

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FWIW, I just used this shell command on my M1 iMac to successfully burn a DVD from an .iso file:

hdiutil burn  ~/Movies/foo.iso -erase -noeject

Is the optical drive connected, and able to read optical media?

The only thing I see "wrong", is the OS won't burn an ISO 9660 disk.

I first tried a Burn folder. That created a Mac OS Extended DVD.

I then tried right clicking on handful of images and chose to burn to disk without first creating a Burn folder. That also worked. Though again, as a Mac OS Extended disk.

The only way I could get a true ISO 9660 disk was to use Toast Titanium 20.

Is the OS burning a hybrid disk? The tests that appeared as a Mac OS Extended disk on the Mac may mount as ISO 9660 when used with a Windows computer, but I couldn't test that. So, I don't know the answer to that one.

I had to buy a third party app to get around this. Happening with multiple ISOs, all of which can be burned using alternative software or with a Windows machine.

So....Toast burns ISO's properly for me using "Copy Image File" so all's well here.

Well, duh! If forgot I have Windows 10 installed with Boot Camp on an older 2018 mini. So, to fully test what the OS is doing, I took a disk with few items burned on it over to Windows.

macOS is indeed burning a hybrid disk. Mac OS Extended for the Mac, and UDF for the PC. Per info found on a search, UDF also addresses ECMA-167, which is equivalent to ISO 13346.

So, not ISO 9660, but a newer variant.

Kurt Lang wrote:

So, not ISO 9660, but a newer variant.

FWIW, ISO-9660 is fully capable of coexisting with all sorts of other volume formats.

Having chatted with one of the folks on the committee for the original standard, that coexistence was the express and intended goal of the design of ISO-9660.

I’ve written tools to create those hybrid disks, as well.

That coexistence can get confusing when the local system detects its preferred media format, and doesn’t detect and report “the other format” is also present.

FWIW, ISO-9660 is fully capable of coexisting with all sorts of other volume formats.

Yes, I know. I was just trying to find out what macOS was doing. And the answer is, it no longer burns ISO 9660. For anyone who specifically wants CDs/DVDs in that format, they're going to have to use a third party option, like Toast Titanium 20.

Kurt Lang wrote:

FWIW, ISO-9660 is fully capable of coexisting with all sorts of other volume formats.

Yes, I know. I was just trying to find out what macOS was doing. And the answer is, it no longer burns ISO 9660. For anyone who specifically wants CDs/DVDs in that format, they're going to have to use a third party option, like Toast Titanium 20.

cdrtools and dvdrtools are additional paths, albeit command-line.

hdiutil burn support is built into macOS, though I’ve not tested that on macOS 15 Sequoia.

I wouldn't worry about macOS using UDF. My test disk opened as if it were always a Windows disk in Win 10.

The only issue I can think of that may cause is if you're handing such a disk to someone using Windows 3.x or older. UDF was first released in 1995, so even PCs shouldn't have too much of a problem with such a disk. The unknown there (to me), is how much UDF may have been refined over the years such that a disk burned in more recent versions of the Mac OS won't behave on very old Windows computers.

But, that's unlikely to be an issue for 99% of the current population. I mean, who still tries to use Win '95 as their daily OS?

So I paid for and installed TT20, tried to burn an ISO. It burned a data disc. I do know what I'm doing, settings were what they should have been. Started a ticket with Roxio but who knows. I'm not a well-versed command line guy but I may have to go that route. Ugh.

I have a large collection of ISO files that are images of DVD-A (hi-resolution audio) discs. Until last week and Sequioa I simply right-clicked on ISO file, burned to an inserted blank and the disc played flawlessly with menus, multichannel sound yadda yadda. I see now--you are correct about my error. Maybe I will need to open the image file and burn TS_VIDEO to DVD.

Drag the file to the disc then right click , burn.

True enough for straight file copying, but Sequoia WILL NOT burn a disk image (ISO) properly. A disaster for many of us who still play and store from physical media. Apple? Apple?