As a followup to my previous post, since this is specifically regarding a 630, the following section of the KB is relevant:

The maximum volume size under System 6 and System 7 is 2 GB. System 7.5 increased that limit to 4 GB and System 7.5.2 (and later) increases that limit to 2 TB on some computers, including:-any computer that came with System 7.5.2 or newer.

-any Macintosh computer with PCI slots.

Click to expand...

The 630 meets neither of these criteria. I tried it out just to see. Under System 7.6.1 I formatted a 20GB drive with a single volume using Drive Setup 1.7.3. The machine refused to boot off it (Happy Mac came up, machine hung for a while, then went to a Sad Mac). I repartitioned to 2GB and 18GB and installed 7.5.5. The machine booted fine, but when it came time to mount the 18GB volume, it displays the following:



However, 7.6.1 mounts the 18GB volume just fine despite the KB not specifically calling out a difference between 7.6.1 and earlier.