I have an old 3.5" HD floppy disk. It was formatted on a Macintosh SE/30 and thus it is formatted with the HFS (not HFS+!) file system. I am having trouble mounting it properly. I have hfsutils and hfsprogs (though I think this is only for HFS+) installed. When putting the disk into my USB floppy drive and rebooting my Ubuntu 18.04 laptop, the disk is mounted, but I can't write to it because it is in read-only mode. Removing and reinserting it will cause it to not be mounted automatically at all.
I tried mounting it manually with explicit rw, but I still can't write to it, only read: sudo mount -t hfs -o rw /dev/sdb /media/andreas/xyz/