The 630 requires "Internal HD Format", which is specific to the 630. Although a hacked Drive Setup from OS 8 should be able to do the job.

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IIRC, Internal HD Format is only for System 7.1.2. For System 7.5.x onwards, Drive Setup will do the job, and you don't even need a hacked version. I just use the version that comes on the OS 8 CD, and it works fine.

For the record, 7200rpm drives do just fine in a 630.