It looks like installer creates MacOS 9 incompatible partition table, but which works fine with MacOS X and Linux.
After partitioning a disk using default settings with MacOS X installer CD I installed MacOS X on its third partition and MacOS 9 on its second partition. Then: - booted the machine using squeeze testing installer cd and backed up partition table to a memory stick. - installed squeeze testing by manually removing the first HFS+ partition and then letting Guided partitioning to "use the largest continuous free space." - rebooted into squeeze and observed that it works fine, it can mount and use all partitions - rebooted into MacOS X and observed that it also works fine, able to mount and use the partition containing MacOS 9 installation - rebooted into MacOS 9: - firmware finds the partition - loads MacOS 9 - MacOS 9 displays a small disk with a blinking question mark, not being able to find any partition - reboot into squeeze again - restore partition table from the memory stick - reboot into MacOS 9, it works fine - reboot into MacOS X, it works fine Hope this helps.
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