According to Quantum technical support, the Pro-80 drive is not compatible with the Quantum Q280 drive which is used in the Apple HD 80SC. They use their own ROM. The Apple HD Setup software cannot be used to initialize the Quantum Pro-80 drive.
To install A/UX onto a Quantum Pro-80 drive, find a third-party disk formatter to format and partition it for A/UX. A good example is SilverLining from La Cie Ltd.
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