Wombat won't boot off 4GB volume

I'm playing around with my Quadra 650 with the 601 PPC card (Apple-branded). MacOS 8.0 installed just fine, but the resulting installation wouldn't boot.

My boot volume is a 4GB image on a ZuluSCSI. The machine is otherwise stock apart from the PPC card and a RAM upgrade. But all I got was a blinking question mark. I used Drive Setup off the install CD to partition the drive.

On a hunch, I repartitioned the 4GB image into two 2GB partitions. After doing that and reinstalling, it booted just fine.

This is MacOS 8.0, so it's still HFS Standard, not HFS Extended/HFS+. I do know there are some limitations on what volume sizes 68K Macs support, but I had hoped the PPC Upgrade card, which has its own ROM, wouldn't have such limitations. Alas..
 
It's a limitation of HFS not the PPC upgrade, with Mac OS 8.1 installed you can then go to town with a large partition.
 
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