Hello, Thomas. Noce to hear from you. > How important ist the partition start at LBA 1 in comparison > to this obvious drawback of grub-mkrescue images on Linux ? > (Start at LBA 0 solves the problem but makes the MBR part > of the first partition. I understand this is undesirable > somehow.) LBA 0 is not an option. It will make hang, at least some versions OVMF, quite possibly other firmwares as well. Nowadays what we have between 1 (inclusive) and isofs headers is all generated by xorriso (except on sparc where we supply LBA 1) It's possible to use another small value other than >1 in order to make a set of headers at another position pointing to the same data.
Another workaround is to mount HFS+ filesystem which is already in a partition (GPT one).
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