I could use diskutil to shrink the partition and then create a new partition, and copy the iso image (via dd) into that partition, and then boot Linux from the internal HD and do the upgrade.

A review of what EFI boot (UEFI firmware) is, how it works, how it interacts with Linux installations, and a few tips and personal experiences on how to configure and maintain it.

I just ran into a big problem on the dual boot Win2K/Mandrake 7.2 machine I'm setting up... I can't write to the NTFS partition from Linux .:( A get a message saying "Read-only filesystem" when I ...

Long story short, it wasn’t intentional; I just heard about Ventoy while browsing the internet and decided to check it out.

Vincent Danen goes over the basics of using the standard dd tool to back up and copy partitions and drives.