Hybrid CDs on Big Sur

[Andrew Udvare]

> On 2022-03-08, at 18:49, Sriranga Veeraraghavan <sriranga at berkeley.edu> wrote:
> 
> Hi,
> 
> I have some older CDs that appear to be master with a Mac (HFS/HFS+) partition and a Windows (FAT32?) partition.  
> 
> Under BigSur (on M1), Finder and DiskUtility only seem to want to mount the Mac partition on these CDs and don’t seem to provide a way to access the Windows partition.
> 
> I’ve been able to access the Windows partition by running on Linux running under an emulator, but this is somewhat clunky.
> 
> Does anyone know of a way (perhaps through a port in macports) to mount the Windows partition on a hybrid CD?
> 
> TIA,
> 
> -ranga
> 
> 
> 

You should be able to use /sbin/mount_cd9660 to mount the area seen by Windows (ISO9660 with Joliet).

mkdir mount-point
sudo /sbin/mount_cd9660 -r /dev/... mount-point

To make an image:

dd if=/dev/... of=x.raw conv=notrunc bs=2048

Also try installing cdrtools and using the 'readcd dev=/dev/... -clone f=x.raw' command.

Both of these may result in a proper image that has the ISO9660 filesystem and the HFS. You should be able to mount the ISO9660 file system with the image with /sbin/mount_cd9660 just the same.