9402 with a destroyed disk unit

Hi Folks.

I´ve got some (maybe stupid) questions and hope you can help me.
Its the following:

Usually I work with Linux (X86, PPC), BSD and NT.
I´m interested in everything and so I took the chance, when somebody offered
me a 9402 F04(V3R2M0).
Yes, I know, it´s an old machine, but for a first experience with OS/400 I
think it´s ok.
(And it was cheap ;-) )

The only problem is:
One of the two internal disk-units (Featurecode 6601) is (physically)
destroyed, so the machine boots only
up to the point, where you can start the service-tools. There is an option
to (re-)install the OS from a tape, but if I
choose it, the machine tells me that "Unit XXX is missing from the
configuration...". My questions are:

1. Is it possible to install /run OS/400 with only one internal disk ?
2. If it´s possible, how do I remove the destroyed unit from the
configuration ? (I didn´t find something possible under "work with disk
units")
3. If it´s impossible, what´s the cost for a new 6601 (if they are still
available)?
4. If a 6601 is not available anymore , which one can I use for that system
? Maybe a 6607 from a 170?

Thanks,
Andre´

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